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Invalid mmi code mts. Incorrect connection or incorrect MMI code - how to fix the error? Problems with SIM

Some users who have devices running Android encounter the error “ Connection problem or incorrect codeMMI" The code itself is used to format ussd requests. These messages occur regardless of which operator is used on the device. However, before proceeding to action, the user worth checking out that he entered a valid request.

A complete list of codes is presented on the operator’s website; perhaps an old code was entered that is no longer used, or the user, out of habit, entered a balance request from a megaphone, although he recently changed his SIM card to a Beeline. If this is not the case and a failure still occurs, then further on what to do in this case will be written.

We use airplane mode to restore operation

If such an error occurs for the first time, this may indicate a small network failure. First, you should try a simple fix method. You can go to settings and click on the airplane icon, which will allow activate airplane mode, which will not use the network.

Then you just have to wait a little, literally 30 seconds, and you can turn it off. Then you should enter the request again; if the error does not disappear, then you need to move on to the next sections. If it doesn’t help, then you should turn off the phone and try to start it again.

What to do if 3G or LTE is unstable

The problem may also occur when poor signal level. You can notice this by the network icon; if it constantly changes type, this can lead to failures in requests. To fix it, you will have to select one specific type of network, they can be found in the settings section, where you need to click on the “More” icon, then you can go to mobile networks, the item you are looking for will be there.

You can try all the options in turn, it all depends on what kind of coverage is in a given region.

Possible malfunctions of the SIM card

This problem is most common when the mmi code fails. Perhaps the SIM card has been in use for a long time, or it was recently moved from another device, and was scratched or damaged. Can remove it from the device and wipe the card with an eraser or alcohol, the same can be done with the contacts on the phone, if you have access to them.

If none of the tips helped, you will have to take your passport with you and go to the nearest salon of your operator. Nowadays SIM cards are changed quite quickly, so it won’t take much time.

If all else fails

  • Worth adding at the end of the request comma, even if in fact it shouldn’t be there.
  • Also worth go to settings, go to calls and go to section locations. Here you need to disable the default country code
  • If a failure occurs after installation some utilities, you should remove them and try again.
  • If the user is behind outside home region , then the reason may be that the phone has connected to another operator or that certain commands are not supported on this network. This should be clarified with support.

Users of phones and smartphones often encounter an error. Typically, this error appears when you try to make outgoing call, send an SMS message or USSD code. Below we will look at several simple methods which will resolve the problem.

A few words about the MMI code itself. The MMI code is used to generate a USSD request with mobile device. Such a request always begins with an asterisk and ends with a hash, for example, *100#.

Mobile operators have long begun to use USSD requests with different codes to perform actions on the phone number from which the request is sent. For example, using a USSD request, we receive information about the current balance and tariffs, send free messages asking to call back, etc.

The error “Connection problem or invalid MMI code” can occur for several reasons:

1. Outdated USSD request. If you enter a USSD request, make sure on the operator’s website that the request you entered is not outdated and entered correctly.

2. . Quite often, users, having connected communication services from an operator many years ago, forget that the SIM card is also subject to physical wear and tear. If your SIM card is more than two years old, contact the nearest store of your operator to exchange the SIM card for a new one. As a rule, this service is completely free.

3. Insufficient 3G/4G coverage. Unfortunately, in our country there is a significant lag in the development of mobile Internet. If large Russian cities already have high-speed 4G Internet, then in some regions Mobile Internet may be completely absent.

If you notice that the 3G or 4G network is working intermittently, periodically connecting to GSM/WCDMA, then all this may lead to the “Connection problem or invalid MMI code” error.

To resolve the error in this case, you need to disable 3G and 4G Internet for a while. You can do this in approximately the following way (the steps may vary depending on operating system, its version and model of your device):

1. Open menu "Settings" ;

2. Go to item "Data transfer" ;

Modern mobile phones have a number of advantages over their older counterparts. This is both the ability to control touch and installation various applications. However, these devices still remain phones - tools for making calls. They often have their own errors related to the GSM module. One of the most common is a message about connection problems or an incorrect MMI code when working with a SIM card.

general information

To understand the problem, you need to understand what the abbreviation MMI means. It is derived from the phrase man-machine interface, which translated from English means “human-machine interface”. The codes of this interface are responsible for correctly recognizing USSD service requests.

In turn, USSD is unstructured additional service data that provides the interactive part of the interaction between a person and a device. This is an algorithm similar to SMS with one significant difference: if the first one serves for communication between the subscriber and the operator or the phone itself, the second one provides the exchange of text messages between users cellular communication. Due to the fact that modern GSM networks are not designed for letter commands, asterisks and hash marks are still used to enter them.

MMI codes are sometimes called service codes and are used to perform the following operations:

  • Checking the current account balance. All modern cellular operators, such as Tele2 or MTS, use exactly this mechanism.
  • Top up your balance using serial numbers scratch cards.
  • Management additional services tariff.
  • Go to new tariff and much more.

Reasons for the error

The most common reason why an MMI error occurs is an inattentively typed service code. To fix this, you need to send the same request again. No one is immune from errors, and the touch keyboard can still sometimes fail.

Most often this happens when the user enters the code with wet hands, and the screen of their phone does not support the work in conditions of high humidity. Then various problems can arise - phantom clicks, errors in recognizing the tap area by the sensor, etc. Few people know what to do if the MMI code on Android is incorrect for no apparent reason.

The source of the problem may be:

  • SIM card error.
  • Incorrect autodetection mobile operator by the phone itself.
  • Invalid network type.
  • Conflicting phone settings.
  • Communication interruptions on the part of the operator or insufficient coverage capacity in a particular location.
  • Third-party applications that interfere with business needs.

Before fixing each of the problems, you need to understand it in detail. There are many solutions, the choice of which depends on the characteristics of the problem.

Problems with the SIM card

Subscribers often find themselves in this situation mobile communications who have not changed SIM cards for a long time. The phenomenon is associated with mechanical and physical wear of the chip in the card. To exclude it, you need to move the problematic SIM card to another device and enter the same code that generated the error. If everything happens again, the card needs to be replaced.

It is also necessary to visually inspect the contact surface of the SIM card. The cause of failures can be not only obvious defects - scratches, peeling from the substrate or visible cracks. If the contacts are darkened or there is entire lines of oxides appeared- this can be eliminated. Using a simple eraser, you need to carefully wipe off the shiny yellow coating. In this case, you should be careful and not overdo it - you can damage the tracks or create a crack.

After this, the card is inserted into the phone and verified. With a high probability, messages like “invalid session code” will no longer appear. If this does not happen and the error continues to occur, the SIM card will have to be replaced. In cellular communication stores, operator representatives allow you to keep your usual number and not renew the contract.

Network and operator settings

Mobile network coverage in some parts of even large cities leaves much to be desired, despite their wide use. Yes, for Megafon Connection problems or incorrect MMI code are not uncommon. Beeline is also not known for its flawless connection. However, operators usually resolve network faults fairly quickly.

In order to eliminate an error on the part of the cellular service provider, you can use the following simple methods:

If none of the methods help, then the module is working. It is worth taking a different route to check the connection.

On some models Samsung phones An invalid MMI code can be resolved in an unconventional way. When typing the service code, you need to add a comma to it. Judging by the reviews, this method has helped many owners of Korean-made smartphones.

Phone settings conflict

Smartphones are configured to work continuously for long periods of time. They can, periodically recharging, not turn off for months. During this period, information is written to the internal memory of the device, read from there, and data is also exchanged between applications and the Internet. This may cause you to suffer RAM- it can be filled with fragmentary information about completed operations until the processor has prepared new ones.

If an error occurs when sending service requests to the operator, you need to perform the following actions:

  • Reboot your phone. A universal tool for correcting most minor errors. A restarted system always works better than one overloaded with temporary files and scraps of data.
  • Reset the settings, having previously saved all important information from internal memory phone and installed applications using a backup utility.
  • Reflash the device by installing a more recent version of the stock software or one of the many custom ones.

When choosing firmware, you should go to one of the specialized resources, for example, w3bsit3-dns.com, and ask if CyanogenMod or LineageOS is available there. These are functional firmware versions based on pure Android without established advertising offers for an affiliate program or utility utilities from the manufacturer. Many users call them excellent alternatives that set software, which is imposed upon purchasing the device.

You should be wary of those custom options that, although they look attractive, are not fully supported by the phone. Sometimes, after downloading the ROM file and going through all the stages, the finished system on Chinese models from Xiaomi did not connect to the Internet via Wi-Fi. At the same time, smartphones produced a similar message - “invalid device ID: null.” To solve this problem it was necessary to do full wipe- deleting, clearing and reformatting the entire internal memory of the device, and only after that - flashing it.

Application problems

IN Play Market There are several million programs for Android devices. Not all of them are equally safe and useful. Even if the developer is pre-certified at Google and created an application that meets all guidelines and requirements, he can update its functionality over time so that important system components are affected. In older Samsung models, a connection problem or an invalid MMI code could occur even because cleaning utilities were detected on the system. Memory managers and pseudo-optimizers could also be a culprit.

You can make sure that the reason really lies in some application when you clean boot the device or, as the developers themselves call it, when starting safe mode. To do this, just start ending the session by holding down the power button. When the pop-up menu appears, you do not need to touch the disable option, but hold it down. After this, another menu will be displayed on the screen, which will ask you to confirm the reboot.

After turning on the device will start without booting background processes, special drivers or services - it will be a black window without a background with the words “ Safe mode" at the bottom of the screen. Then you need to enter the code that was causing problems and check that it runs.

If a communication device was purchased “gray” or from abroad, programs could be installed on it that openly use connection ports allocated for USSD requests for various purposes. One of such programs can be called VLock (VeLok) - a means of reading and storing electronic locks using a telephone NFC chip for Western security systems and intercoms.

Another potential pest is the advanced mobile photography tool FX Camera. There is no mention of access to mobile or wireless networks in the license agreement or list of permissions required.

Sometimes such applications can be eliminated only by flashing the firmware. However, there are special removal and cleaning tools that can quickly remove even deeply embedded programs from the internal memory.

Change location

Some smartphones display this error due to system problems, constant changes location of the owner and his frequent crossing of state borders. At the same time, even flashing the firmware, which seems to solve any difficulties, does not help. The solution to the problem is quite trivial, but obviously not for every user.

In the settings for incoming and outgoing calls, there is a “Location” section. Among other settings, there is an item that is almost always checked - “Default country code”. If you turn it off, before the dial number there will be no prefix +7, +4 or +3. Service signals will begin to pass through, and the smartphone will work normally.

The opposite situation is also known, when automatic geolocation recognition and adding regional prefixes helped. In any case, if technical problems always worth using different variants their solutions and be ready to experiment.

Everyone who has mobile phone android, encountered a pop-up window when typing USSD command: "invalid MMI code." There are different interpretations of the message, but they have one thing in common - the MMI code. What does the mysterious message mean: connection problems or incorrect Tele2 MMI code?

MMI – linking code between USSD request om subscriber and the operator’s service application. It is sometimes formed incorrectly and an error appears, which is visible on the screen in the form of a corresponding message.

Causes

A problem in generating a code occurs for various reasons: a breakdown of the gadget, user inattention when entering the USSD number, a breakdown on the server of the service company. The first two points can be corrected by the user himself; we will analyze them further.

What to do, connection problems or incorrect mmi code Tele2 on Android

There are a lot of ways to overcome problems, at least one will work. Most often, a connection problem occurs due to the subscriber’s own carelessness and entering unnecessary invalid characters in the request or invalid commands.

Send the USSD command again

The most common command among users is checking the balance using *100#. Did the phrase “faulty MMI Tele2 code” appear as a result of checking your account? You need to check the connection, if everything is fine with it, then send the request of interest several times with an interval of 5 minutes. If this does not help, you should contact your operator to rule out the possibility of problems with the service company.

Turn airplane mode on and off

A useful key in every Android is airplane mode. When enabled, all communication capabilities on the device are disabled. After disabling the mode, you need to enter the desired USSD request again.

If the operation of the gadget is prevented by a failure in its system, then you need to reboot or turn it off and on, then check for an error.

Network type changes

Today there are network types: 4G, 3G, 2G. You need to try switching to another type in order to eliminate the error. In the settings you need to find the section “ Mobile networks" and in "Network mode" select a different type than the current one. Next, dial USSD; if there is no error, you can return to the previous network type.


Operator network check

It happens that the device is configured by an operator that is not needed. To check the settings, you need to go to “Mobile networks”, to the “Network operators” section and select the desired telephone company. Manipulation will help, especially if there is roaming.

Often normal operation The phone is hampered by additional downloaded applications. To disable all applications and leave only system settings running, you need to install “Safe Mode”. It will allow you to find out whether they are interfering third party programs functioning of the smartphone.

To turn on the mode in most phones, you need to hold your finger on the “Power” button for several seconds. Next, a sign will appear indicating the transition to safe mode or the smartphone will immediately turn off. When turned on, there will be a “Safe Mode” mark at the bottom of the screen. In the mode, you need to type the command of interest and see if the smartphone begins to work better.

To reset the mode, the phone needs to be rebooted.

Problems with SIM

A faulty SIM card can cause an MMI code error to appear. The card may be old, worn, or improperly cut. Only replacing it with a new one will help. The service is provided free of charge in any service center operator.

If the above methods do not help resolve the problem, all that remains is to contact your telecom operator for help; perhaps the problem is not with you, but with the service organization.

USSD services are long-established standards for communication between subscribers cellular networks with service servers. Sending USSD messages is reminiscent of communicating with bots on Telegram and other services where they are widely used. By sending a command, the user receives a response - this can be certain data or information about the execution of the requested service.

Many smartphone and telephone users do not even imagine what a USSD interaction service is, although they regularly use it. Balance check, change tariff plan, connecting services - all this can be done with most mobile operators via USSD commands, such as: *100#, *135#, *105*5# and thousands of others.

When accessing the USSD service, the user may encounter the following error: “Connection problems or incorrect MMI code.” In such a situation, you must try to send the request again, making sure that it is correct. If the request for data or the command fails again, you will need to troubleshoot the connection.

You can see an error about an incorrect MMI code on Android, but it makes no difference which mobile operator used: Beeline, MTS, Megafon or any other. One of the methods described below should help you get rid of the error.

Invalid MMI code due to a bug in Android

Google is actively bringing Android to perfection, but this does not prevent various bugs from appearing, especially after smartphone developers introduce their own services, shells and user installation third party applications. As a result, an MMI error may appear due to bugs in the system; in such a situation, it is easy to fix:

These actions allow you to “reboot” the networks, since in “Airplane Mode” they are disabled. If the method does not produce results, you can also try restarting your smartphone.

MMI connection problems caused by cellular communications

Often the error “Connection problems or incorrect MMI code” occurs due to a problem with the SIM card or cellular connection. Remove the card from the smartphone and inspect it for damage, as well as for dirty contacts, wipe them if necessary. Also pay attention to the contact pad on the smartphone itself, and clean it if necessary. Next, replace the SIM card and try sending the USSD request again.

If clearing the SIM card contacts did not solve the problem, you can try setting the network type to a fixed one. It is possible that the problem is due to bad connection and constant loss of cellular signal. In such a situation, on your Android smartphone you need to go to:

“Settings” - “More” - “ Wireless network» - “Mobile networks” - “Network type”

Select one of the available network types instead of the default one. For example, if the smartphone communicates with the operator via LTE, set it to 2G or 3G.

Important: Try accessing the USSD service from all types of networks.

As a last resort, you can try to solve the problem by replacing the SIM card by contacting a mobile phone store.

Additional ways to resolve MMI errors on Android

If none of the above methods help, you can try returning your smartphone to the state it was in before the error occurred. For example, if in last days If options on the device were changed or applications were installed, all new items should be removed and the parameters should be set to their previous values.

Another method that often helps to get rid of an error with an incorrect MMI code is to send a potentially erroneous request. It is recommended to send the command “*100#,” instead of the “*100#” request, that is, with a comma at the end. To place a comma on your smartphone keyboard when dialing a number, you need to hold down the asterisk.

If the error does not disappear after trying to fix it using all the methods described above, you can try resetting the phone to factory settings or completely resetting it. Please note that in this case some data may be irretrievably lost.