Connection problem or invalid mmi code. “Connection problems or incorrect MMI code” - what is the error and how to fix it. Invalid MMI code: how to fix

USSD requests greatly simplify interaction with a mobile operator. But sometimes glitches occur, leading to errors like “Invalid MMI code” on Android. What to do in such situations is described in this article.

Reasons for the error

A USSD request is a digital code sent to the operator’s servers, which returns the result in the form of a message with the requested information. These combinations are used to check the account balance, tariff plan etc.

Factors influencing the occurrence of the error:

• invalid code;
• network problems;
• smartphone system failure.

Solution options

Before following the instructions, make sure you enter the correct code that is available to your operator.

Pay attention! On some smartphones, the problem is solved by adding a symbol to the USSD code being dialed. For example, “*100#,”. To add a comma, press the “*” button, and to add a semicolon, press the “#” button.

Enabling Airplane Mode

The likely cause of the problem is a network problem. To reconnect to it, you need to turn airplane mode on and off.

Pay attention! The instructions are applicable to Andoid 6.0 and MIUI 9 shell. In other versions of the software, the names of menu items or their location may differ.

Also for quick access to mode, hold down the power button until the shutdown menu appears → select “Flight”.

Rebooting the smartphone

If manipulating the airplane mode does not solve the issue, you should restart the device.

Wait for the phone to boot and check that the USSD request has been sent.

Changing the network type

Poor signal level affects the appearance MMI errors and depends on the default network type.

Replacing the SIM card

The SIM card needs to be replaced if it is outdated and does not meet the new standards. This is also necessary when physical damage(even minor ones). To do this, visit your operator's office with your passport and ask to replace it. This procedure is quick and free.

Conclusions

The appearance of an error reporting an incorrect MMI code is due to several reasons. You should reconnect to the network using Airplane mode or reboot your device, change the network type, or add a symbol to the message you are sending. USSD code. As a last resort, you need to replace the SIM card.

When performing USSD requests, various types of errors may occur. A very common situation occurs when, after sending a request, a notification “Connection problems or incorrect MMI code” appears on the screen. MMI is a query code used to connect the user and the operator. Sometimes this process fails and an error appears in front of you. We will talk in detail about how to fix it in our article.

Method for correcting the error “Connection problems or incorrect MMI code.”

Reasons for the error

This phenomenon may occur in your phone due to incorrect settings or due to a malfunction of the SIM card. First, you should try to fix the problem yourself, but if this fails, then it’s time to turn to your mobile operator for help. An incorrect MMI code may appear when using any operator: MTS, Beeline or Megafon. The brand of the device also does not affect this process, however, it has been noticed that on Android devices, in particular from Samsung, this problem occurs more often. However, most likely this is due to the fact that this brand of gadgets is in great demand.

Invalid MMI code: how to fix

Method 1: Retry the request. Sometimes you get an error when entering a request, but you do not experience any problems with communication. In this case, you should repeat the input after a while, since, most likely, your operator is to blame for the failure.

Method 2: Turn on airplane mode. Airplane mode can disable many functions. If you encounter connection errors on your Android, then open top panel and switch airplane mode to the active position for a few seconds, then turn it off. After this operation, everything should fall into place.

Method 3: Reboot your smartphone. If turning on Airplane mode did not help you, rebooting your device may resolve the connection issue or invalid MMI code. Reboot or turn your gadget on and off, then check it for a malfunction.

Method 4: Change the network type. Modern devices can work with 4G communications. However, it does not always work stably on Android. This can be understood by the change in the inscription next to the communication stripes. The question arises - what to do? If you are faced with exactly this situation, then you need to change the network type:

• open Settings.
• go to " Wireless networks» – « Mobile networks" – "Network type".
• select the 3G option, if it does not meet the requirements of your region, then select 2G, then everything can be returned to its place.

Check if your queries are working now.

Method 5: Change SIM card. Sometimes the SIM card gets damaged and loses its main function. In this case, you must contact cell center for new card. Contacts located on your old sim card, and those that were not saved to the phone memory will be deleted. If you purchased a new SIM card, but the error occurs again and again, check whether you have inserted it completely into the appropriate slot. You can also remove the card and put it back in place again. You can also check the quality of its work on another smartphone.

Method 6: Put your phone in safe mode. Sometimes third party applications may affect some processes in the device. To determine whether a “foreign” program is to blame or not, you need to go into safe mode. To begin, hold down the power button on your phone. Then, in the menu that opens, hold your finger on the “Shutdown” item. A dialog box will appear in front of you, informing you that you have entered safe mode. After clicking "OK" your phone will be launched. It will only contain system programs. Therefore, you will be able to determine whether the third-party software is at fault or not.

If none of the methods described above helped you, then you should contact your operator. Most likely, some work is being done on the server.

We hope that our article helped you. If you have any questions, ask them in the comments.

Very often, owners of Android smartphones periodically encounter an incomprehensible error while using the gadget. The device displays the message: “Connection problem or invalid MMI code,” which translated into Russian means “Connection problems or incorrect MMI code.” The MMI (Man-Machine Interface) code is required to generate USSD requests.

Manipulating settings and rebooting

The most in a simple way, which, however, may work is to reboot the Android smartphone. If after this the situation with the appearance of the error has not changed, we try to fix it using the settings. To do this, go to the corresponding section of the menu, turn on the “Airplane” mode, give the device 5-10 seconds to reconfigure, after which we turn off the airplane mode and check the result.

It may also be that one of the recently installed applications is causing the problem. You can check this by loading your smartphone into safe mode. Turn off your smartphone. Press the power button and hold down the “Volume -” rocker until the manufacturer’s logo stops showing on the screen and a message appears indicating that the device has booted into safe mode. Check if the error has disappeared (if it has disappeared, you will have to spend some time searching for the application that is interfering with the normal operation of the device in order to remove it).

Changing the request code

Another simple way is to supplement the query with a regular comma. For example, a request for account status to Megafon will look like this: *100#, . To add a comma, you need to hold down the * button.

Weak signal level

If the signal level is weak or unstable, the smartphone searches for a stable signal, constantly changing the network format - 4G, 3G, WCDMA, EDGE. You will have to go in the direction of lowering the speed by going to the settings (“Settings” -> “More” -> “Wireless networks” -> “Mobile networks” -> “Network type”) and forcefully selecting 3G or even 2G.

When roaming, a foreign operator is selected

A fairly common situation that the user may not notice until he needs to send a USSD request: the Android smartphone is configured to cover another operator. Go to settings and select your coverage from the available networks. mobile operator manually. If it doesn't help, then maybe where you are, this request not supported. Contacting support will help you clarify this issue.

SIM card status

Perhaps it was cut, moved many times from one device to another, or something else. The shabby appearance of the card, although it does not always indicate microcracks inside, is the reason why it is reasonable to replace it without waiting for serious communication problems to arise at the most inopportune time.

Send the USSD request again

Let's say that you decided to find out your account balance by sending a request *100#, as a result of which you received an error, but you do not observe any problems with communication. Try sending the USSD request again, and after a while, if that doesn’t help, try again. This may be a problem on the carrier's side.

After that, send a USSD request. Most likely everything will work.

Reboot your smartphone

In general, turning on and off airplane mode should be enough to solve communication problems. However, perhaps the problem is in the smartphone software - say, there was some kind of glitch. In order to return the device to its previous form, simply reboot it. Or turn it off and on again - whichever is more convenient for you.

After turning on, check the device for errors.

Put your phone in safe mode.

Sometimes third-party applications can affect some processes in the device. To determine whether a “foreign” program is to blame or not, you need to go into safe mode. To begin, hold down the power button on your phone. Then, in the menu that opens, hold your finger on the “Shutdown” item.

A dialog box will appear in front of you, informing you that you have entered safe mode. After clicking "OK" your phone will be launched. It will contain only system programs. Therefore, you will be able to determine whether the third-party software is at fault or not.

Reading time: 41 minutes

Typical for smartphones that are trying to send a request to check an account, the amount of traffic, or similar actions. In general, MMI is translated as “Man-Machine Interface”. The interface is generated upon sending USSD requests.

USSD requests are those for which, when sent to the operator, the robot generates data that is relevant only to you, for example, a balance. Thus, interactive interaction with the operator occurs mobile communications. USSD requests are typically preceded by an asterisk and a closing pound sign.

Incorrect connection or incorrect MMI code - reasons

The reason that problems occur, including an incorrect MMI code, may be the phone itself, which has incorrect settings, or a failure may occur due to incorrect operation of the SIM card. You should first try to fix the problem yourself, and if there is no positive result, contact the operator for help.

Usually the error appears at the stage of forming the request, that is, it has not even been sent to the operator’s robot yet. Accordingly, somewhere at the stage of creating the necessary request, a failure occurred or the network was unable to transmit it.

The appearance of the error is not affected by the type of operator or smartphone/phone model, the problem is somewhat detached from these factors, however, an increased number of similar errors have been noticed on Android, and in particular Samsung smartphones. Most likely, this state of affairs is caused by the widespread use of brand gadgets.

Connection problems or incorrect MMI code due to smartphone settings

Now let's look at the incorrect MMI code and what to do. Initially, you should check, probably the reason is a simple settings failure. If the error appeared once, then you can try sending the message again after a short period of time. When there is still no positive result, you should make sure that you are entering the correct code. Information about verification codes located on the operator's website.

A small trick that often helps is changing the notification mode:

1. Expand the list of settings by swiping from top to bottom;
2. Activate airplane mode;

1. After a short time, about 30 seconds, turn off the mode and repeat the procedure of contacting the operator.

If this maneuver does not work, you should restart your smartphone. Hold the "Power" button for 10 seconds, then turn on the phone. In case of failures in the settings, the action should work.

Additionally, you can reset the settings to original state, for this you use either the smartphone function of the same name or recovery mode. The first is a more gentle option, the action is performed like this:

1. Go to “Settings” and select “Backup and reset”;

1. Next, click on “Data reset”, and then “Device reset”.

Invalid MMI code on Android - manual network installation

Modern gadgets have long learned to work with 4G communications; it is very fast and advanced, but equipment modernization on the part of the operator slows down progress somewhat. Thus, an unstable connection may occur, then the smartphone will independently change the technology to another one that is currently available.

Such automatic transitions negatively affect the quality of communication and may be accompanied by interruptions. The problem is indicated by a changing inscription near the display of the number of antenna rods. You should independently set a more stable communication format, even if it is less progressive. To do this you need:

1. Go to "Settings";
2. Expand full list using the “More” button;
3. Follow the link “Wireless Networks”;
4. Next, select “Mobile networks”;
5. Click on the “Network type” parameter;

1. It is recommended to make the 3G point active; if it does not meet the requirements due to the terrain in the region, then change it to 2G.

The coating should now be maintained at the same level and the cause of the error can be eliminated.

SIM card wear

Unfortunately, there are situations when, due to mechanical deformation or prolonged use, the SIM card is no longer able to perform its direct function - to maintain communication. In this case, you will have to contact service center for a new card. In this case, contacts that were recorded only on the card memory will disappear.

If the error appears after the next SIM card change, don’t be upset, you probably just didn’t insert the card all the way. Try removing it and installing it again. Sometimes the contacts become somewhat deformed, so that a gap is created, generating an obstacle to communication. This may also cause the card or battery latches to break. You can check the functionality of the SIM card on another phone.

Replacing the card if you apply with identification documents is a quick procedure, and you will be able to keep your number.

Conflict over applications

Some programs are unable to function properly in general or in a specific environment. Such applications cause all sorts of problems, including with the network. To check whether you really have this problem, you should start your smartphone in safe mode. This way, no secondary programs are launched. To initialize this mode, during the startup process, you should hold down the “Menu” button until the smartphone is completely loaded, and the action will be accompanied by a corresponding inscription.

If the error disappears, then the application is the culprit. Conflicts between the FX Camera program and the network have been observed, otherwise you will have to sequentially go through the extensions until the cause is determined.

In the end, if the problem still persists, then you can confidently point the finger at the network operator. Most likely he is carrying out work, modernization, etc. online. Then there is nothing left but to wait for a solution to the problem on his part.

If you still have questions on the topic “Wrong connection or incorrect MMI code - how to fix the error?”, you can ask them in the comments