Sometimes an attempt to call a subscriber MTS may be crowned with an answering machine message. Basically, you can hear that the user is currently offline or blocked. There is an extremely rare error “This type of communication is not available for the subscriber”, which many subscribers have never encountered. Let's find out the most relevant and common cases in which this phrase may sound from the speaker of your phone.
Network errors
Many operator users are used to hearing automated messages reporting network or account problems. In the case of information about the unavailability of communication for the called subscriber, there is nothing to worry about.
Ensuring the uninterrupted operation of all elements providing MTS communications on the territory of the Russian Federation is a difficult matter. No one is insured against malfunctions. It is curious that the phone of the called interlocutor at this moment can be turned on and fully functional. Accordingly, the person you are calling will not even suspect about the problem. The easiest way is to postpone the call until later. Most likely, after a few minutes, normal network operation will be restored and your interlocutor will be able to receive an incoming call. Nevertheless, against the background of errors that occur, the message about an unavailable connection is a very rare occurrence.
The phone works as a modem
The notification “This type of communication is not available for the subscriber” can be heard even if the person you are calling to has connected his mobile phone to a computer to work on the Internet. Often, when a call comes in, the Internet connection is interrupted, because MTS gives priority to providing voice communications. But no one is immune from mistakes, sometimes the operator may make mistakes, due to which you will hear an answering machine when you call.
You can call again a little later. The called subscriber by this time can turn off the Internet or network failures will stop.
The called subscriber is in roaming
Before making a voice call, make sure the person you are calling is not
now outside the Russian Federation. Theoretically, if such a subscriber has a positive balance, then no 
communication problems should not arise. However, in roaming it can be problematic to keep track of the bill. There are two most convenient ways out for solving the problem - top up a person's account or try to call later, depending on the situation, use the most appropriate one. By the way, an error may occur due to communication problems with an operator providing its services for communication in roaming.
Debt
Sometimes you can hear this notification by making a voice call to the subscriber MTS whose number is blocked. As we know, blocking occurs in the absence of timely replenishment of the account. Just try to contact this person later, maybe he will fix the situation by replenishing his balance. Or call him back on another phone, if available.
Broken SIM card
You will have to face the notification “This type of communication is not available for the subscriber” if the person you are calling has problems with the SIM card or the connector for it in the mobile phone. This is solved by contacting the staff of the official MTS office or to a service center, respectively. By the way, this voice message causes some discontent among users due to the ambiguity of the wording. Most agree that the operator should change this alert to make it more specific.
If there are no obvious reasons for this error to appear, we recommend contacting the call center of the MTS operator. The manager will study the problem, give an unambiguous answer and help you figure it out.
What does it mean "this type of communication is not available for the subscriber"?
- top up the account to an amount sufficient to pay for the necessary services;
- pay the invoice.
If the answering machine says that this type of communication is not available for the subscriber (in English it sounds like this: Sorry, this type of call cannot be setup), then this means that number blocked... In this case, both paid and free services are not available to the subscriber. You can unblock the number by replenishing your balance. More information about the types of blocking and how to determine the blocking can be found on the MTS website.
This type of communication is not available for the subscriber standard excuse MTS, if the called subscriber has little money on the account or minus balance.
Anyway, don't worry, your phone is fine.
Try to call your subscriber 2-3 more times, usually you dial.
The mobile operator MTS (Mobile Tele Systems) has long introduced the practice of blocking subscribers with a negative balance, provided that they do not use the credit limit service or have gone beyond the provided credit.
If you call an MTS subscriber and hear the phrase this type of communication is not available for the subscriber then the person does not have enough money on the mobile phone balance. As soon as he deposits the money into the account, you can call him without any problems.
Yes, everything is simple ...
Any operator in the world has a certain type of service, which is subdivided by directions and dates, the ability to perform something using the mobile gadget of this operator. All these services are divided into paid and free, but both of them must first be activated before they are available for use ...
Let me explain with an example: there is such a type of service as fax transmission. It is disabled for almost all operators by default, and if you suddenly want to send a fax or receive it to someone, you first need to activate it, for this, ask the operator whether it is paid or not ... Until it is available activated when it is executed, you will receive an SMS or the robot's voice will say:
this type of communication is not available for the subscriber
the same happens if you have been disconnected from any type of service, for example, for non-payment or at the end of the validity period ...
This type of communication is not available for the subscriber
The people also write that the message this type of communication is not available for the subscriber may occur if the subscriber has a negative balance. The exact amount depends on the tariff plan. And if the subscriber is in the subway.
Information on this topic can be clarified on the MTS website or from the support operator. But I cannot guarantee that this will help you. My friend has an MTS operator and he has the phrase this type of communication is not available for the subscriber pronounced in various situations. Logically, it should mean that a person does not have enough money. And since in our country incoming calls are free, it means that he is abroad and he does not have enough funds to receive a call. But when my friend stupidly rides on the subway and is not available, I also hear this phrase when I call.
Probably almost everyone is familiar with the phrase This type of communication is not available for the subscriber; which we hear when we call this or that subscriber. More often, of course, this happens if the person you are calling has run out of funds in the account, or he went into negative balance. So he cannot receive calls. It is also possible that the subscriber you are trying to reach is blocked. So everything is fine with your phone and SIM card.
Phrase This type of communication is not available for the subscriber in most cases, you can translate as follows does the subscriber want to top up his balance? Another very common option is temporarily blocked by MTS.
In order to understand what the phrase means This type of communication is not available to the subscriber.
(Sorry, this type of call cannot be setup) you can see this information on the MTS website. It describes all types of locks, issued messages and methods of removing locks. So, in order to remove the blocking for the indicated phrase, you must:
This message can appear in several cases.
If you run out of money in your account.
If the activation period for any service has expired and it needs to be renewed or paid.
If you are in a place where the signal is very weak or not received at all.
Perhaps something could have happened to the SIM card, so if such a phrase sounds often enough for you and you cannot eliminate it, contact the office of the mobile operator, or even better, change the SIM card (if you ask, the SIM card can even be sent to the same number issue a new one).
Recently, MTS very often uses the phrase This type of communication is not available for the subscriber on the answering machine. This phrase means that the subscriber has a negative balance, and this type of communication is not available to him. Also, such a phrase may mean that the subscriber was blocked for not using MTS services (if you don’t replenish your account for a long time, don’t call or send SMS, the sim card is blocked, I did that with the sim card of the MTS operator).
I heard this answer when I called the number of the SIM card in the 3G modem. Those. this number is not intended for receiving incoming calls, in other words THIS TYPE OF COMMUNICATION IS NOT AVAILABLE FOR THE SUBSCRIBER. It's all logical!
At the same time, SMS and outgoing calls are allowed (through Connect Manager, you can dial the number and call through the computer)
Sometimes the phrase this type of communication is not available to the subscriber is heard in the telephone receiver. This usually means that your account has run out of money or you have lost money and you can no longer call.
Sometimes there are failures when calling.
You should either clarify your balance on the phone, if it is in plus then call back the desired subscriber again, it is advisable to call from another place (take a couple of steps).
26.09.2018
Sometimes you can hear in MTS “this type of communication is not available”. What does it mean? This means that not all telecommunication services are provided and available to the subscriber you are calling.
Typically, this situation occurs for a variety of reasons, and this can be either with the knowledge of the subscriber or forcibly. A similar voice message from the operator can be received for the following reasons:
- with a negative balance on the personal account, incoming ones are often disconnected, since they are provided on a paid basis;
- when blocking a number: permanent or temporary with the consent of the owner of the number;
- in some cases, in the event of a malfunction of telecommunication equipment in the region where the subscriber is located;
- if the SIM card is damaged;
- when it is difficult to obtain a cellular signal in the network coverage area.
A similar voice notification "This type of communication is not available for an MTS subscriber" appeared in the practice of the largest provider quite recently. The practice of providing free services for incoming calls is a thing of the past. Free incoming calls are available only for some tariff plans. Accordingly, when the quota within the subscription fee is exhausted, incoming calls may also become unavailable for the subscriber.
In another case, such a message is issued when the phone is voluntarily blocked, for example, when traveling abroad. This measure allows you to suspend the provision of services for a certain period, it is provided free of charge for two weeks. Then the service is provided with a daily subscription fee.
No money
So, you are faced with a situation when incoming calls are not available for the subscriber of interest. Of course, you are interested in the question of how you can get through to the person of interest. If incoming calls were only available, but literally that's how you stopped dialing. This may mean that the limit has been exhausted and a "minus" is formed on the account.
In this case, the service on the number will be resumed when the account is replenished. If you top up the subscriber's account, the incoming will become available - immediately call your friend or relative and do not worry. Send an SMS, when the phone is on and the list of numbers is open, your friend will definitely receive a message.
Blocking
Another reason for such a phrase that subscribers may forget about is blocking. Operators can block the use of the phone if the account has not been replenished for a long time, there are debts. When there is a negative balance, an informational message is received, it is recommended to replenish the account in order to receive incoming calls and avoid blocking.
The reason may also be a voluntary blocking by the client. This is usually necessary to avoid overpaying for unnecessary services when going on vacation. Try to dial the number you need after 14 days (this is the period of free use of the voluntary blocking service) or send an SMS. If the phone is not blocked, but in roaming, then the subscriber can receive a message.
Network failure
In some cases, a card in a home region or roaming within Russia cannot use the service and call other regions, or cannot reach you. In this case, you often hear that the desired interlocutor does not use this type of communication. This could be due to an accident or network repair, and not to the fact that he blocked the phone.
Send a message just in case if you can't wait long for the completion of the repair work. SMS will be delivered as soon as possible.
SIM card
If you are with your friend or with your own phone working and calling your mobile or calling a friend, you again hear the phrase about temporary blocking, with a likely positive balance, and this also lasts for several days, in such situations you need to check the operation of the SIM card. You can endlessly say that the company is to blame for poor telecom services, but it is possible that communication is absent due to the fault of the person who owns the phone. With a sufficient amount of funds, when the payment was credited in the right amount and on time, the absence of repair work, we can talk about a faulty SIM card as a result of mechanical damage, prolonged exposure to water, and so on. How to find out and fix it:
- call the support service from your mobile (0890) or landline phone (8 800 250 8 250), find out your balance and information about the absence of repair work on the line in your region;
- contact the MTS salon with a request to check the card, it will be replaced in the event of a malfunction.
After that, the connection can be used without restrictions.
Disconnected phone
Usually, when the phone is turned off, the voice answering machine reports that the subscriber is unavailable because the phone is turned off. How can this be fixed? Obviously, you won't be able to get through instantly with the help of mobile communication. In this case, you can contact by sending an SMS on the website or from your number. If the service items include receiving free SMS, and the subscriber also has enough money in the account while the device is operating, he will receive a message.
SMS as a type of communication always works when the number is available on the network. You may not be able to make a call, but you can send a request from yourself to contact in one way or another. The only drawback is that the subscriber will receive the message only if he turns on the working phone within the admissible delivery time.
Signal
If you have poor reception on your phone and you hear a voice message when you call your cell phone number, viewing the company's coverage may help you. Moreover, this is typical even for those cases when the balance will not be negative. Probably, for confident reception, you need to top up your account and activate roaming services.
For example, it will look like this:
- poor reception may occur in remote regions with only 2G coverage;
- a message about the unavailability of the service may come in areas of poor reception when conditionally crossing the border of the Home region or Russia. This is typical for border areas, when the coverage and location of addressing is not precisely determined;
- it is possible when using the LTE and USIM standards, in some cases, when establishing a 4G / 2G transstandard connection, malfunctions may occur. Please call again or temporarily set your phone to use only 2G standard.
These tips will help you get through to your contact person. We wish you good luck and pleasant communication.
For many people, staying connected is very important. Often they ask the same from their close people and just acquaintances. Therefore, when they are faced with the fact that someone's phone is not answering, it confuses them, especially if the autoinformer sounds instead of the usual beeps. The worst thing often occurs to such people. But most likely, everything is in order with the relative. You just need to correctly interpret the phrases of the answering machine.
One of these messages of the autoinformer is: "This is not available for the subscriber." This phrase can be heard for a variety of reasons. And the first thing to check is the amount of money on the account of the caller himself. It is possible that there simply are not enough funds to make such a call. It is also necessary to cancel the barring of outgoing calls using the combination # 33 * 0000 # or 002 #.
If, after that, you hear in response that this type of communication is not available to the subscriber, then this is due to the called number. There may be several reasons. The most common of them is the negative balance of the subscriber while in roaming. In this case, until the money is credited to the account, you will not be able to get through to him. True, he will still be able to receive SMS.
Another reason can be an accidental or deliberately set barring of incoming calls. In this case, you just need to cancel it, and the subscriber will be able to receive calls. To do this, dial the combinations # 35 * 0000 # and 002 #. If, in this case, the system replies that this type of communication is not available to the subscriber, it is possible that his number is blocked. To resume service, you can apply with a passport to the nearest office or to the contact center of the mobile operator. A specialist will be able to quickly resolve this problem.
But it also happens that this type of communication is not available for the subscriber, and it is for the one who is calling. It is possible that his number was simply added to the Black List. In this case, you can only do one thing - call from another phone. If you managed to get through, then most likely it is. Unfortunately, until the subscriber himself removes the number from this list, nothing can be done.
If all the reasons are eliminated, and the situation has not changed, and this type of communication is not available to the subscriber anyway, you need to restart the telephone and move the SIM card to another mobile. If this does not help, then you need to contact your mobile operator for help. There may be a network failure and need to be repaired. You just need to be prepared for the fact that it will take some time to solve the problem. Although, of course, any cellular company does its best to resolve issues as soon as possible.
In any case, do not be afraid that the subscriber is unavailable. What does this autoinformation message mean, you can always find out on the company's website or by contacting its consultants in the contact center or the nearest office. And after that, take all the actions recommended by them. Surely it will turn out that everything is solvable, and in the near future it will be possible to easily contact the called subscriber.
Today mobile communication has become an integral part of the life and work of any person who has been touched by the hand of civilization. But you have to pay for communication, and if an MTS subscriber, when dialing a number, is overtaken by a treacherous phrase like "There is not enough money on your account ...", the procedure is very clear. But when he hears "This type of communication is not available ...", the further algorithm for solving the problem is not entirely clear, right up to the emergence of panic. In fact, there may be several reasons for such a reaction of the operator, and the subscriber is obliged to navigate in them.
The first reason is intuitive
MTS, like other mobile operators, usually informs its subscriber that he has exceeded the limit on his personal account, which automatically means the impossibility of making outgoing calls or surfing the Internet. The service voice message, when trying to call, in some way echoes the notification "This type of communication is not available ...". Therefore, it is not surprising that the first consideration that comes to mind is the lack of funds to make calls. And, oddly enough, this message does not refer to the subscriber who makes the outgoing call, but to the one who receives it.
Most often, a similar situation can happen if the receiving party is in roaming. In this case, both interlocutors are forced to pay for the call, and if the account balance is not commensurate with the current tariffs, then the calling party will receive a corresponding notification. As statistics show, usually replenishment of the balance immediately solves the problem.
The second reason is automatic
The next case, directly or indirectly calling the voice message "This type of communication is not available ..." when trying to dial from the MTS number, is blocking the target subscriber. The reasons for such an action can be different: either the subscriber himself voluntarily blocked the number, or he does not have enough funds in the account. By the way, the system does not name a specific reason for blocking, limiting itself to a general reservation.
If we refer to the operator's comments on this matter, it turns out that the robot automatically generates a notification without going into details. Such an incident can be solved only by unblocking the number in person, or by replenishing the account balance until it is sufficient to make calls.
Reason three - technical failure
Despite the fact that the equipment and the principles of mobile communication themselves are constantly being improved, the notification "This type of communication is not available ..." may also indicate not the subscriber's personal problems, but a failure in the MTS network itself. It is logical to assume that if the system collapsed for some reason, then technically the possibility of making outgoing / incoming calls, sending messages or surfing the Internet is not available.
Considering the incident described above with the moment of blocking, the system in this case will not go into details, limiting itself to a general disclaimer. The only difference from the previous cases is the practical impossibility of influencing the problem in any way - you will have to wait until the technical failure is corrected by the support service.
Reason four - identifier
Another reason for informing the MTS subscriber that "This type of communication is not available ..." is the difference in the purpose of the SIM-cards used. The fact is that most of the operator's customers use SIM cards, which are initially focused on making voice calls and, in combination, on wireless Internet access.
At the same time, the company sells other SIM-cards, which are intended exclusively for organizing web surfing, for example, within the framework of the Home Internet and TV service. By default, such identifiers are deprived of the ability to support voice communication and there is no way to solve the problem, unless you purchase a new universal SIM card.
The fifth reason is banal
The next unfortunate misunderstanding, which leads to the announcement for the MTS subscriber of the type "This type of communication is not available ...", may be a banally disconnected device of the planned interlocutor. In most cases, the notification has a slightly different, more familiar to all content about "being out of the network coverage" or "temporary unavailability".
But, as already mentioned above, the notification is generated by the system automatically, without the participation of the operator, therefore, from time to time, surprises are possible.
The sixth reason is network
Well, and the last objective reason that "This type of communication is not available ..." for a subscriber of the MTS company may be the network signal, more precisely, its low level or complete absence. As a rule, such a situation causes various kinds of malfunctions for operators, and therefore you should not be surprised that when you try to make an outgoing call, an already known phrase will sound.
Message "This type of communication is not available for the subscriber" in the mobile network sounds when, for one reason or another, the subscriber is completely blocked by the voice call service. There may be several situations when an operator blocks incoming voice calls. We will consider them in this article.
Let's say right away that if you hear this message, this does not mean at all that you have been added to the "Black List" or that the subscriber drops your calls.
Balance at zero: the operator is blocking incoming
The problem of combating the unwillingness of subscribers to pay for communications is part of the “corporate culture” of telecom operators. And many subscribers, having a negative balance on the account, did not replenish the account, continuing to work “for reception”. Therefore, the operator invented such a preventive measure as "blocking for financial reasons."
If your subscriber's balance is negative (note, not zero, but less than zero), incoming calls are blocked for him, and the “type of communication” becomes “unavailable”. There can be two options for solving the problem:
- If you need to contact urgently, you can simply top up your subscriber's number. It is enough to throw in a hundred rubles for the number to be unblocked and you can make a call.
- Contact the subscriber via spare communication channels, including SIM cards of other operators, electronic channels, etc.
- Try to send SMS. Blocking incoming SMS by the operator is not practiced.
Barring calls while roaming
- Or he has little money on his account (not enough even for 1 minute of incoming calls)
- He independently set a ban on incoming calls, as he does not want to pay for them.
By default, the connection is active in roaming. But incoming calls are very expensive, in some countries the price is measured at several dollars per minute. Therefore, the following scenario is quite possible: a person has gone abroad, and you call him. Then the call is disconnected, and after you call him back again, you already hear that "This type of communication is not available for the subscriber." This just means that the money on the account instantly disappeared, and now the incoming subscriber cannot accept.
In this case, you should also use SMS and send a message. Or try to call other numbers, if available.
Voluntary blocking of numbers
Mobile operators have a number preservation service, the so-called “voluntary blocking”. This service allows you to avoid blocking the number for financial reasons, as well as other sanctions for inactivity of the subscriber. For the service of voluntary blocking, 1 ruble is debited every day.
If the subscriber has activated the voluntary blocking service for himself, he is subject to the same restrictions as when blocking at the initiative of the operator. Accordingly, voice calls are prohibited for him. Therefore, the solution to the problem is to try to get through to another number.
How do I know if I'm on the blacklist?
By and large, you can only find out by indirect factors. The only thing that you can know for sure is that the clear signal "This type of communication is not available to the subscriber" is not used to block subscribers in the black list. If you hear the message "The subscriber's device is turned off ...", this may indicate a blacklist. The best way to check is by calling from another number.
Cases when the phrase about an unavailable form of communication for an MTS subscriber implies a debt
Everything is in order with your money, but the one to whom you called clearly owes a debt to the mobile operator. Calling back to any other available number, you will be convinced of this: the call will go through without any restrictions. But the subscriber, when dialing whose number you heard a similar phrase, not only paid, but also free services are not available. In order to return to communication in the MTS network, he needs to replenish his account to an amount sufficient to make a call or send a message. And if, according to the tariff plan, the subscriber has a minimum positive balance, then the amount must be paid taking into account the value of the specified balance.
Cases when the phrase about an unavailable form of communication for an MTS subscriber cannot be associated with debt
The words in question may sound even if the person you called has turned on the voluntary blocking. This happens when the number is not used for a long time or when you leave the country without using the Russian number in roaming and other cases when a phone with an MTS card becomes unnecessary for some time. It can also happen that the phone is lost or stolen, for this reason the subscriber blocked it, got busy and is temporarily unavailable for calls.
It happens that you hear a similar phrase when you call a very close person, for example, your husband or brother, and you know for sure that he did not go anywhere and did not turn on the blocking. Moreover, the debt on the mobile account could not lead to the disconnection of the incoming connection, since the service "On full trust" or simply a loan is used. However, even in this case, the phrase does not mean anything other than the disconnection of both paid and free services for the subscriber: as the user of the MTS number cannot call anyone, so can he. This is most often due to the fact that the person simply forgot to pay the invoice for the last month. Therefore, in order to correct the situation, you just need to pay the amount that was formed at the end of the previous month.
The situation when incoming calls were completely free for all mobile subscribers is a thing of the past. Payment for all types of services provided has been introduced by a number of large providers, including MTS. This situation is associated with an increase in the number of services, the complexity of the infrastructure and the need for its monetization. In some cases, when making a call, you can hear: “ This type of communication is not available for an MTS subscriber". What does it mean? Do not be alarmed, it's okay, just for a number of reasons the subscriber cannot receive the call due to the unavailability of the service for him.
This usually happens for several reasons:
- if the subscriber's account goes into negative territory and incoming calls are disabled;
- with voluntary temporary or permanent blocking;
- in rare cases - in case of network failures;
- in case of failure of the SIM card;
- due to the complexity of the signal.
"This type of communication is not available for the subscriber- what are the ways out of the situation if you need to quickly contact a person? The problem is quite trivial, it only requires choosing the right solution. In most cases, you can still contact the subscriber, you just need to change the dialing form.
The subscriber has no money
How to get a debt in MTS?
The message - "This type of communication is not available to an MTS subscriber", may be if there is a lack of funds on the account. In some packages, incoming calls may be disabled when there is a minus and after the expiration of the period for replenishing the minus account.
You can solve the problem and continue to speak freely after the replenishment of funds. Moreover, if a subscriber uses a plan with monthly billing, in such situations, his mobile can be “connected” only when paying a monthly payment by SIM card.
What can be done:
- top up your account with a small amount;
- pay the subscription fee according to the tariff.
Blocking
If the balance is negative, and the subscriber did not try to avoid blocking, then the incoming can be blocked.
The reason may also be more trivial, for example, your friend is roaming and does not want to use the service from his card.
Even if the subscriber has blocked the incoming and his number while not using the SIM card, you hear the answer about the impossibility of communication, while there are other ways to contact him. Your interlocutor can answer SMS if you cannot get through. They are available outside the MTS network zone when traveling abroad free of charge.
What can be done:
- send SMS if the user is roaming.
Network failure
Despite the reliability of the MTS telecommunications infrastructure, network failure may occur depending on the region. The message given by the answering machine that "this type of communication is not available to the subscriber" in rare cases may indicate equipment failure. It is impossible to determine the exact reason for this phrase.
If there is money on the number and account, the service is available, call with a short interval, the operators usually quickly fix the failure.
Information on availability can be clarified in the telephone mode on the operation of the network segment in the support service on 0890. Try also sending a message, perhaps the subscriber will get in touch himself.
What can be done:
- contact support;
- view the coverage map;
- wait until the problem is fixed.
SIM card
Another problem, when you can hear a message about the unavailability of communication from the person you need, is a faulty SIM card. It is defined by the operator, but does not work correctly. In this case, even with the availability of funds, you can hear such a message.
Try to contact the subscriber in another way and report a possible problem.
If a service package fee is paid, the problem repeats, the card can be checked and replaced at any post office.
If at the same time there is a debt with an unused number, we recommend that you check the items of expenditure on the site and deposit some money to establish a positive balance.
What can be done:
- inform the subscriber that his card does not accept calls.
Disconnected phone
When a mobile device is disconnected, a voice message is usually given that the subscriber cannot receive a call or is out of the network area. In some cases, users confuse it with the inability to provide a service. If the subscriber has the “They called me” service, you will receive a message when he is available in the network again.
We also recommend sending a message or making a voice recording using an answering machine. With a long-term non-repayable negative balance, all free and paid services can be disabled. In this case, a message from the cellular operator about the unavailability of services, which we are talking about, usually sounds.
What can be done:
- leave a message;
- wait for the appearance on the network.
Signal
Poor reception areas
In some cases, a message about the unavailability of communication services for the subscriber may be issued with an uncertain signal. For example, in some 2G coverage areas. The choice of the reason for the unavailability of the subscriber is selected by the system automatically, therefore, when a person is in the zone of uncertain reception, you can get such a response from the company. Viewing the coverage map is available on the provider's website and other resources.
Border crossing
Such communication is often typical for being in border areas, during the journey, when, for example, a train moves a short distance through the territory of another state or in the area of cellular towers of foreign operators. This can be clearly seen in the example of Blagoveshchensk, near the border of Finland and Belarus. To be constantly in touch, you need to top up your account and activate roaming.
4G / 2G
A similar problem can be encountered when using an LTE 4G - USIM card. For example, if you are trying to establish communication with a subscriber that does not use LTE capabilities or is out of coverage. Try to change the settings of your phone and call back the subscriber strictly in 2G format. Usually newer devices allow you to do this without problems, but there are certain limitations in installations.
