What is mmi code. Wrong MMI code or wrong connection - problem solution

When you try to make a phone call or at the time of sending SMS, you can see a message on the phone screen about a connection problem. This error can also appear when checking the balance on your phone or tablet. In our article we will tell you how to do certain manipulations in order to restore the connection.

The MMI code is a request from a mobile device that contains an asterisk and a pound sign in its characters. This kind of character combinations are used by users for service operations. MMI code is executed on mobile devices and tablets, with any operating system. Let's analyze the main ways to solve the problem with MMI.

Often a connection error occurs due to a non-working SIM card. It may have physical damage, so you need to contact the service center to replace it.

3G is a modern mobile communication technology and Internet access provided by telecom operators. 3G technology continues to be tested, it may not work stably in all regions. Therefore, the MMI error may occur due to the lack of stability of the network coverage.

To fix the error, you need to go to the phone settings.
Then go to the "Mobile network" or "Network mode" tab and select the "GSM only" network mode.

You need to restart your phone for the settings to take effect. The connection or MMI code error should disappear.

It happens that when you try to call, send SMS or make a request to the operator, your phone displays a message "Connection problem or invalid codemmi» . This message may appear at the most inopportune moment, and cause a lot of inconvenience, especially when your business is urgent. In this article, I will explain what is the problem of incorrect mmi code, and also share the best methods on how to fix connection problems or incorrect MMI code, making your Android phone work long and reliably.

The code MMI(Man-Machine Interface - “Man-Machine Interface”) is used to formulate USSD requests that allow organizing interactive interaction between network subscribers and operator service applications. The user uses MMI to find out the balance, replenish the account, connect or disconnect any service, switch to another tariff plan, and so on.

Usually the MMI code starts with an asterisk and ends with a pound sign; for complex queries, an asterisk is also used as a separator.

Connection problem or invalid mmi code - causes and solutions

This error can occur with different mobile operators and with different mobile devices, manifesting itself in the form of the message “Connection problems or invalid MMI code”, “Invalid MMI code”, “Connection problem or invalid MMI” and others.

Often a problem with mmi code appears suddenly, and can disappear just as suddenly, leaving the user at a loss about the real sources of its appearance. Below I will list the existing causes of the problem, as well as talk about how to fix the problem.

Unstable operation of the operator's 3G networks

The work of today's 3G networks in Russia, Ukraine and other post-Soviet countries is still far from ideal. There are failures, signal loss, unreliable operation of equipment and other troubles that manifest themselves on your device in the form of switching the network icon from 3G to 2G and back.

To solve the problem of connection problems or an incorrect MMI code, it is enough to temporarily disable the 3G connection, giving your operator time to correct the problems.

Physical deterioration of the SIM card causes connection problems or incorrect MMI code

One of the most common problems. If the SIM card has been working for you for many years, or is often removed and inserted, then it may lose its performance due to wear and tear. Try connecting it to another phone and see if it works. If another phone has a similar problem with an incorrect MMI code, then you can try to wipe its contacts, and if the problem continues, contact your mobile operator's office for a replacement (experts recommend changing the SIM card every 2 years).

Problems with device settings

Incorrect device settings, as well as malfunctions in its operation, can cause a problem - connection problems or an incorrect MMI code.

Try restarting your device, and if the problem persists, try performing a hard reset.
Go to "Settings" - "Backup and reset" - "Data reset" - "Reset device" (otherwise "Settings" - "Backup" - "Data reset").

Temporary problems with the mobile operator

In this case, it remains only to wait. You can call the operator and find out how long the error with the MMI will be observed.

Operation of some applications

Some of the externally downloaded applications may be causing a connection error or an incorrect MMI code. To confirm or disprove this suspicion, boot your device in safe mode and try to make a request to the operator. If it goes well, then some fresh application from those installed on the phone is to blame, which will need to be removed.

Find out how on your device on the website of the manufacturer of your gadget. On my Samsung it's done like this.

First you need to turn off the device, then press the button to turn it on, and after the device turns on, you need to hold down the "Volume Down" button for a few seconds (while the developer's logos are displayed).
After these steps, your smartphone (tablet) will boot into safe mode (you will see an inscription about this at the bottom of the screen), and you can test its operation.

Conclusion

As we can see, connection problems and an incorrect MMI code are usually due to the instability of the mobile operator's networks, as well as the physical deterioration of the SIM card. The causes of the problem can also be incorrect phone settings, as well as third-party applications that can cause malfunctions in the mobile device. If a similar error is observed, then, first of all, try to contact your mobile operator - it is quite possible that the reason is not with you, but with him.

Users of phones and smartphones often encounter an error. As a rule, this error appears when trying to make an outgoing call, send an SMS message or a USSD code. Below we will look at a few simple methods that will fix the problem.

A few words about the MMI code itself. The MMI code is used to generate a USSD request from a mobile device. Such a request always starts with an asterisk and ends with a pound sign, 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 get information about the current balance and tariffs, send free messages asking us to call back, etc.

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

1. Legacy USSD request. If you are entering a USSD request, then make sure on the operator's website that the request you are entering is up to date and entered correctly.

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

3. Insufficient 3G/4G coverage. Unfortunately, in our country there is a strong backlog in the development of mobile Internet. If large Russian cities already have high-speed 4G Internet, then in some regions there may be no mobile Internet at all.

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

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

1. Open the menu "Settings" ;

2. Go to item "Data transfer" ;

When executing USSD requests, various kinds of errors can occur. Very often, a situation occurs when, after sending a request, a notification “Connection problems or incorrect MMI code” appears on the screen. MMI is a querying code used to connect a user and an operator. Sometimes this process fails and an error appears in front of you. How to fix it, we will talk in detail in our article.

How to fix the "Connection problems or invalid MMI code" error.

Reasons for the error

This phenomenon can occur in your phone due to incorrect settings or due to a SIM card failure. To begin with, it is worth trying to fix the problem yourself, but if this was not possible, then it is time to contact the 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 when entering a request, you get an error, but you do not observe any communication problems. In this case, you should repeat the entry after a while, since your operator is most likely to blame for the failure.

Method 2: Turn on Airplane Mode. Airplane mode can disable many features. If you experience connection errors on your Android, then open the top panel and turn on Airplane Mode for a few seconds, then turn it off. After this operation, everything should fall into place.

Method 3. Restarting the smartphone. If turning on Airplane Mode didn't work for you, then after rebooting the device, the connection problem or invalid MMI code can be fixed. Reboot or turn your gadget on and off, then check it for a failure.

Method 4: Change the network type Modern devices are able to work with 4G connection. However, it does not always work stably on Android. You can understand this by changing the inscription next to the communication stripes. The question arises - what to do? If you are faced with just such situations, then you need to change the type of network:

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 the requests are working for you now.

Method 5: Change the SIM card. Sometimes the SIM card gets damaged and loses its main function. In this case, you need to contact the cellular center for a new card. Contacts that are on your old SIM card and those that were not saved to the phone's memory will be deleted. If you purchased a new SIM card, but the error occurs again and again, check if you have placed it completely in the appropriate slot. You can also take out and put the card 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 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. First, hold down the power button on your phone. Then, in the menu that opens, hold your finger on the "Shutdown" item. You will see a dialog box informing you about the transition to safe mode. After clicking "OK" your phone will be started. It will contain only system programs. Hence, you will be able to determine if third party software is at fault or not.

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

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

Today we will talk about a fairly well-known error that users of smartphones based on the Android operating system may encounter. When sending USSD requests, the message “Connection problems or incorrect MMI code” may appear on the smartphone screen. Also, the message may look like “Connection problem or invalid MMI code” or even in English - Connection problem or invalid MMI code.

This is what the error looks like on the device screen:

In English:

The question arises - what is MMI? MMI or Man-Machine Interface is a special code used to generate USSD requests that provides interaction between the subscriber and the operator's service applications. Occasionally, a crash occurs, resulting in the indicated error. What to do? There are several possible solutions, we will talk about them in more detail.

Send USSD request again

Let's say that you decide to find out the account balance by sending a request *100#, as a result of which you receive an error, you do not observe communication problems. Try sending the USSD request again, and after a while, if it doesn't help, try again. Perhaps this is a problem on the side of the carrier.

Turn airplane mode on and off

Airplane mode, as you probably know, allows you to turn off all communications of the device. Turn on the flight mode for literally 5-10 seconds, then turn it off again so that your smartphone finds the network.

Then send a USSD request. Most likely, everything will work.

Restart your smartphone

In general, switching on and off the flight mode should be enough to solve communication problems. However, perhaps the problem is in the software of the smartphone - let's say there was some kind of failure. 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 an error.

Change network type

Try changing the network type. Let's say you use networks in "Auto" mode. You need to try changing the network type to 3G or even 2G - for a while, then you can return everything to its original state.

Go to settings.

Find the "Wireless networks" section (in the example, a Huawei smartphone is used; on devices from other companies, the interface may vary slightly).

Tap on the "Mobile network" line.

Click Preferred Network Type.

Change the network type. Ideally, you should use a mixed network type (“Auto”), most likely, you have it installed. Select a different network type, wait a minute and return to Auto mode.

Then send a USSD request. If it doesn't help, select a different network type and try sending a USSD request with it.

If you are using "4G only", in which case you will not be able to send USSD requests anyway, switch to the mixed type of network mode ("Auto").

Make sure your network is selected

This may be caused by some kind of glitch. You need to select the coverage of your carrier. To do this, go to the same section "Mobile networks" and select "Operator".

Wait for the download and select your carrier's network. Although it is better to use automatic network selection (switch at the top of the screen).

The procedure can help, especially if you are roaming.

Disable VoLTE

Still in the same mobile network settings, try disabling "VoLTE Calls" if this feature is supported by your device (thanks to a user named Oleg for the idea).

Then try to specify the USSD command.

Boot in safe mode

There is a small chance that the error is related to the operation of some application. How can you make sure of this? It is enough to enable safe mode.

In this mode, Android only launches system apps, so you can immediately tell if the app is the problem or not.

Try adding a character to the USSD request

Some users claim that adding a character to the USSD request can help. For example, a comma.

The USSD request works, oddly enough.

SIM card problems

An error also occurs if there are problems with the SIM card. For example, it is very old and it is time to replace it, or you cut it incorrectly. In such cases, USSD requests will not work at all, you need to replace the SIM card.