I can not accept the challenge on android. IPhone does not accept calls

Often android users Follow the problem of blocking incoming calls. The phone does not display information about the call received, and your interlocutor comes an automatic message about the unavailability of the subscriber on the network. Of course, android does not accept incoming calls and deprives him main function - Ability to associate two interlocutors. This problem may arise due to malfunction. software Smartphone, gps module breakdown or in case of failure. Let's try to solve the problem when android does not accept incoming calls.

Flight mode.
When setting up the phone, you can inappropriately turn on the "aircraft" mode. The selection of this profile is characterized by the fact that all active networks will not be available, but the phone will work. You will not be able to call, send SMS or use the Internet, incoming calls will also be blocked. Offline mode Widely used in flights, as well as to save the battery charge. For disconnection this regime Need to perform several simple operations: Click the smartphone's power button, turn off the FlightMode.
SIM card and android has not taken any incoming calls.
There are cases when the SIM card is weakly concerning the phone contacts. This can be caused by a breakdown of a slot, an unsuitability of a card or weak fasteners. If the card has departed, then on phone will disappear Network, and you will not be able to use communication services. A message on the absence of a SIM card will be displayed on the screen. Your actions in this situation are extremely simple: we take a map, wipe the chip, insert the map back. Earned? Excellent. If the network is still not identified, then the problem is most likely in the slot. To fully verify the inoperability of the equipment, you should insert another card. If there is no network, then we boldly hand over the phone to repair.
There is no signal and the android may not receive incoming calls.

The coverage area has different operators. Do not be surprised if the phone does not recognize the network in the forest - it is justified by a weak signal. Also, most phones begin to lose the network in large ravines, deaf places, basements. To restore the network performance, it is necessary to find the coverage area and android will again receive incoming calls.
There are also a number of internal problems that cause the loss of the network. With such breakdowns at home, it is not to cope, because you need special equipment and spare parts. To perform repair work, it is better to contact a specialized company that will replace your phone.

Sometimes there are such situations that you have on the table or lies in your pocket the phone, but for some reason calls do not come. Why doesn't your phone call? Let's look at the list of typical reasons.

Why does not ring mobile phone

Why happens so that it is impossible to call with cell phone Or even take a call?

• Problems with SIM card. The phone may not work if you left the service area. Look, whether your operator is defined on the phone. Or maybe on the monitor it is written: "No network." If there is no network, but you are sure that you are in the access area, remove the SIM card from the phone and insert it again. Perhaps she just moved away. If it did not help, insert the SIM card to another phone. In the event that it does not work on another apparatus, the reason is in it.
• Problems with battery. The reason for the fact that you cannot call from the mobile can serve as a discharge or failure rechargeable battery. In this case, charge the phone or purchase a new battery.
• Damage to the phone. The reason may be in the phone itself. Water could get on him, you could drop it. Perhaps your phone has already exhausted your resource or you caught a poor-quality apparatus. To clarify the exact reason, contact the workshop.
• Money ended in the account. True, in this case, you will most likely get through to you, but you will not be able to make a response, until you replenish the balance.

Why does not ring stationary phone

Now let's see why the city phone does not call.

• Lack of payment. Remember whether you forget to pay telephone services. Specify the status of the current account with your operator.
• Nutrition problems. If you use the radio telephone, make sure that its battery is charged, and the base is connected to the power grid. Without it, he will not work.
• Faulty apparatus. Check for the health of the telephone itself. To do this, turn on the phone into the outlet in another room, where there is exactly telephone communications. If the device and there does not give signs of life, take it to repair or replace the new one.
• Cable problems. If it turned out that the device is working, check the presence of contacts in the places of wire connections. Look, whether the wires coming from the tube to the device and from the device to the outlet. Did anyone have a phone plug from the socket socket. Is there a gust in telephone cablecoming from the shield. After eliminating these problems, your phone can earn.

Read also an article

"Why can't get through to me, although I have a phone turned on" - frequent questionwhich sets subscribers of different operators (MTS, Beeline, Tele2, MegaFon). Most often, the calling gets short beeps (occupied) or the callback that the subscriber is temporarily unavailable. It also happens that with a complete antenna, the call does not pass, just after only the messages that prompted the missed calls. Today we will tell about all sources of failure, in which it is impossible to reach.

Causes of communication failure

It is impossible to answer this question in advance. It is necessary to comprehensively explore all the circumstances, on the basis of what to draw conclusions. Immediately note the most popular reasons:

• malfunction and / or damage Sims;
• oS damage, firmware malfunctions, software glitches;
• incorrect communication module settings or other hardware breakdowns;
• operator problems - the most common cause.

What if you can't get through to you?

As a rule, the reason is clarified by excluding options. For convenience, let's consider each source of the problem separately. Let's start with the study of SIM.

Fault or Damage Sims: How to determine?

A simple and logical solution will be such an order:

Partial malfunction or damage can lead to the fact that the challenge will be able to make. After inserting the card to another phone, the story is repeated exactly. At the same time, the other SIM card works well and without problems. In this case, you just need to contact the communication center and make a request to replace the SIM card with the same number.

Failure of Soft

Glitches and bugs with intensive use of the device arise regularly. It is possible to determine their scale as follows.

Communication module and hardware breakdowns

To begin with, it is worth saying that some smart phones with two sim cards have only one radio module. Accordingly, "online" then there will be only one of the cards. If this is not your case, then try simply restart the device or enter the flight mode. Helped, but the problem regularly appears? Take advantage of a hard-reset or refrusting the device to the stock firmware with the office. Site. Such moments are diagnosed quite problematic:

Problems of Operations

Smartphone can stop receiving incoming after unsuccessful firmware? Other malfunctions may be observed. This occurs due to the use of an inappropriate ROM file (more often a custom firmware) or a version of a radio module. Incompatibility is solved by flashing. If critical damage occurs, you will have to seek help.

• The cause of failures can be the air updates of the system. Therefore, it may be effective to roll back the Operations previous version With the subsequent disconnection of auto updates.

Malfunction from the operator

• The lack of a high-quality network is the usual thing. Often in a densely populated area there is a fairly weak equipment that is not able to correctly serve customers. Especially acute the problem is manifested in holidays and concerns all popular operators - MTS, Beeline, Tele2, MegaFon, etc.
• Another option is the lack of coating or repair work. Anyway, the subscriber temporarily comes out of the network coverage area. It is quite logical that in this case the signal in the phone or is missing, or at a minimum.
• The operator can block the subscriber for violations of the network utilization (hooliganism, spam, etc.) or in the absence of replenishment for a certain period of time (as a rule, year). In the message from the operator of the caller, it is about blocking.

To improve communication quality, you can use a special software or connected hardware. Opportunities are greatly limited, therefore it is not about improving communication, but about its optimization. In the playmarket there are enough programs that allow you to automatically configure the phone to the desired mode of operation - for example, "quick settings".

• The plug-in instrument is selected depending on the remoteness from the tower and the presence of interference on the line. Some professional systems can actually improve the quality of communication in a small area when the tower is removed by 30-50 km. Often they enjoy owners of country houses.
• If you find a malfunction after flashing, you must check whether Imei phone. You can find it by typing a combination * # 06 #, and to compare the code with the number indicated on the box or under the battery. Flowing IMEI can be restored - the video instructions about this set.
• If the VAZ calls, and you have eternally employed, then turn off mobile Internet - completely! And all synchronization too. Especially if the operator transmits data on the channel 2G, 3G, then receive calls using the Internet is sometimes impossible. At least in standard hardware.
• There is a chance that incoming calls are prohibited on the phone. You can do this in the device itself, for example, in the settings of the modes, or by operator. In the first case, it helps to disable this function or any of the types of reset, and in the second - the call to the operator.

Conclusion

In most cases, problems are short-term, regardless of the cause. If you tried all the proposed methods and tips, and the phone is incorporated to you, then, most likely we are talking about a deeper breakdown, to diagnose which it will work in the service center.

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MTS subscribers are often faced with situations when their phone is turned on, but they cannot receive incoming calls. There is quite a lot of reasons why you can not get through to MTS. Consider the most common.

Reasons associated with your phone

First of all, consider the basic reasons why you can not receive incoming calls. It can be:

• "Enlightening" of the radio module phone. If the phone is registered on the network, but there are no incoming calls to it, the easiest way to diagnose is to try to call somewhere alone. If, instead of the beeps of the call, you will see the message "Communication failure", you need to restart the phone. For smartphones, the option is suitable with the inclusion of 10 seconds "Flight Mode".
• Alternated work of telephone radio With multiple SIM cards. If your phone supports several sims, in most cases the remaining sims are blocked when one of them is active. Accordingly, while you speak one number, it is impossible to call others.
• Fault phone or SIM card. In particular, the failure of the Mobile Network name and error messages associated with the lack of a SIM card may indicate the breakdown. Find out what happened, you can use the second phone. Try to remove the SIM card from your phone and paste into another. If another machine is registered on the network and accepts calls, then the problem is in your device. If the same symptoms appeared on another phone - the problem with the SIM card or network.
• The presence of malicious software, various filters of incoming calls and other challenges to block calls. For incorrect setting They can make your room inaccessible for incoming calls.

Causes associated with the network

The mobile network is also not always working flawlessly, so there are situations for which it is impossible to reach you.

• Poor coating quality. If you are in the zone of the uncertain signal, it is likely that you will constantly. Accordingly, you can not get through in those intervals when your phone is not serviced.
• Repair work or accident B. mobile networks. If you are within the service radius base stationwhich moved to mode maintenanceCommunication may temporarily abyss.
• In some cases, with poor radio plane, There are situations where the phone shows a signal level of 100%, but you cannot get through. In such situations, it is enough to simply move or restart the phone.
• Incoming calls can be missed indoors. If you sank to underground levels (ground floor or basement), or went deep into the monolithic building, it is likely that your phone is no longer serviced.
• Simultaneous conversion. A rather funny situation when two subscribers are trying to reach each other and cannot do this, since each other is interfered with each other. The reason is that if you recruit the number of the subscriber who gains your number, you will be for each other "outside the network coverage area."

Therefore, the recipe for the control of "network" glitches is a reboot of the phone, moving and some patience. Sometimes for 5-10 minutes, all problems are solved by themselves.

Reasons related to blocking number

It is important to listen to what exactly the answering machine says when you have a set of your room. If a message sounds that the subscriber is temporarily unavailable, it means that the network "does not see" your device. If the message sounds that the "Subscriber is temporarily blocked", it can talk about financial or other reasons for blocking your number by the operator.

The attacker can implement an attack on the output of the phone from the working state, and the phone user will not even guess. Wherein mobile device will be included. Mobile device will not be able to make incoming calls and SMS messages. On the phone phone, the communication power indicator will show maximum value. To implement such an attack, attackers do not turn to cellular operator. The attacker can realize such an attack while spending not much effort. The only thing that gives the attack is a quick discharge of the phone battery. The phone will quickly discharge. Some phone models when exposed to attack include the backlight of the phone, and it does not turn off while the attack goes.

With such attacks, threats are created, in which possible breakdowns of important negotiations or critical situations when you need a working phone. Sometimes such attacks are only part of large Plan Regarding the user.

How do attackers implement such attacks?

The article on SMS spam describes the principle of operation of SMS services. But few knows that such services can be implemented by undocumented possibilities. There is a special form of SMS messages - invisible SMS. Such SMS are not displayed on the phone screen and are not notified by the phone about its receipt. Such SMS are commonly used by operators, to verify the existence of a mobile phone, but whatever the user would have learned about the request. The attackers can use this to implement DOS attack on a mobile phone.

The implementation of the DOS attack through the invisible SMS is implemented because the SMS messages implement the signal level in the GSM network. Such messages are clogged by the news channel. You can create generators send invisible messages using HTTP or SMPP protocols. The basis of invisible-SMS enters simple scheme. Table 1 shows the format sMS messages. Using these parts, an SMS is formed and the SMS center is sent.

Table 1.

Field	Size in octets.	A type	Description
command_Length.	4	integer	Length of the entire message
command_ID	4	integer	The identifier of the entire message
command_status.	4	integer	Status
command_Number	4	integer	Unique serial number
service_Type.	4	string	Service type or NULL
source_addr_ton.	max 6.	integer	Type of sender number
source_addr_NPI	1	integer	Sender indicator
source_addr.	1	string	Address of the sender
dest_ADDR_TON.	max 21.	integer	Recipient number type
dest_addr_npi	1	integer	Indenticator sender
dest_addr.	1	string	Address of the recipient
eSM_CLASS.	max 21.	integer	Message type
protocol_id	1	integer	Protocol identifier
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