What is an invalid mmi code. Connection problems or incorrect MMI code - what to do. Weak signal level

Often, owners of Android smartphones report that while using the gadget they periodically encounter an incomprehensible error. The device displays the following 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. And, indeed, in most cases, the problem arises when trying to perform actions related to sending such a request to the operator - switching to another tariff, obtaining information about the account or traffic balance , connecting or disconnecting a service, etc. Here are several ways to solve the problem.

Method 1: Manipulating settings and rebooting

The most in a simple way, which may nevertheless work is . If after it a situation with the appearance of the error “Invalid mmi code" has not changed, we are trying to correct 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 is possible that the problem "Connection problems or incorrect MMI code" is caused by one of the recent installed applications. You can check this by loading your smartphone into . To do this, run the following actions:

• 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).
• There is information that Samsung smartphones In some cases, the "Invalid mmi code" error is caused by the FX Camera application.

Method 3: Change the request code

Another simple method that, according to users, works, despite the seeming absurdity. It consists of completing the request 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.

We will attribute other cases of the error “Connection problems or incorrect MMI code” to problems with the connection, but we will also consider options for correcting the situation. The problem can be solved through the settings of the Android smartphone.

Case 1: 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 can even visually determine the cause of the error - the network type indicators will change above the signal strength indicator. In this situation, you will have to go towards lowering the speed by going to the settings ("Settings" -> "More" -> " Wireless network" -> "Mobile networks" -> "Network type") and forcefully selecting 3G or even 2G.

Case 2: A foreign operator is selected in roaming
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. Nothing wrong with that. If you want to send requests, go to the settings and select the coverage of your mobile operator manually from the available networks. Did not help? Perhaps where you are, this request not supported. Contacting support will help you clarify this issue.

And finally, the saddest option, when the cause of the problem is SIM card status. Perhaps it was cut, rearranged many times from one device to another... In short, the shabby appearance of the card, although it does not always indicate microcracks inside, is the reason why there is a reason to replace it without waiting for serious communication problems to arise at the most inopportune time .

As you can see, the error “Connection problems or incorrect MMI code” is explained simply and just as easily solved. However, you always have the option of calling a free service technical support mobile operator instead of sending a USSD request. The choice is yours!

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 the 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.

Sometimes users encounter various kinds of problems that arise when using smartphones based on operating system Android. Today we will look at the “Connection problems or incorrect MMI code” error. It can occur when trying to make a call, send an SMS message, or even when requesting a USSD command.

MMI or Man-Machine Interface is the code used when generating USSD requests, but occasionally a failure occurs, which leads to the error that we are discussing in this article.

The error itself looks something like this:

The error may also appear on English language: Connection problem or invalid MMI. The essence of this, however, does not change.

Now let's talk about solutions that will hopefully help you deal with the problem.

Reboot your device

The very first and simplest thing to do in case of such problems is to restart your smartphone. For what? It happens that there is some glitch in the software that leads to an error. And a reboot in many cases allows you to cope with this (and not only) problem.

Turn on airplane mode

An option that sometimes helps you avoid rebooting your smartphone is to turn on and then turn off airplane mode (sometimes called “Airplane mode”). As you know, in this mode, any data transmission is suspended, and after shutdown, it is turned on again. In this simple way you can try to get rid of the error.

Disable the "Add country code" feature

A solution that has helped a huge number of users: the country code is automatically added to the number, which in turn can lead to the described error. We will show an example of disabling functionality based on a Xiaomi smartphone.

Open “Settings”.

Tap on the section with system applications. Sometimes system applications can be found in the main “Applications” section, for which, as a rule, you need to click on the menu button somewhere at the top of the screen, and then select “Show system applications” in the menu that appears. In our example, this section is placed separately.

Find the “Phone” or “Calls” application and tap on it.

Click "Contact Locations".

Move the "Add Country Code" switch to the "Off" position by simply clicking on it.

After that, try making a call or sending a USSD request.

Change network type

Go to settings, select the “SIM cards and mobile networks” section.

Click Preferred Network Type.

Change the network type.

Usually this is 3G or 4G, but not lower, although you can try, for example, turning on 2G, and then 4G again.

Select operator network

Go back a step and select “Mobile networks”.

Make sure your current network is automatically selected, for example:

If not, then change it, fortunately this can be done through the settings.

Add a character to the number or USSD request

Users write that sometimes a non-standard option helps - adding a symbol to the phone number or USSD code. This could be, for example, a plus sign:

Remove and reinsert the SIM card tray

Another option that may help is to remove the SIM card tray: remove it and put it back in.

Make sure the SIM card is working

To do this, use another phone or smartphone. If an error occurs in this case, the problem is most likely with the SIM card; it needs to be replaced. If everything is fine, the problem may be with your phone. Alternatively, you can reset all data.

Today we will talk about a fairly well-known error that users of smartphones based on the operating system may encounter. Android systems. When sending USSD requests, the message “Connection problems or incorrect MMI code” may appear on the smartphone screen. The message may also 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, which ensures interaction between the subscriber and the operator’s service applications. Sometimes there is a crash that results in the above error. What to do? Possible solutions several, let's talk about them in more detail.

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.

Turn airplane mode on and off

Airplane mode, as you probably know, allows you to turn off all communications of the device. Turn on airplane 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.

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.

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 (the example uses Huawei smartphone, on devices from other companies the interface may change slightly).

Tap on the line “Mobile network”.

Click Preferred Network Type.

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

After that, 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 in any case, switch to the mixed type of network mode (“Auto”).

Make sure the operator network is selected

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

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

The procedure may help, especially if you are roaming.

Disable VoLTE

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

Then try entering the USSD command.

Boot in Safe Mode

There is a small chance that the error is related to the operation of an application. How can you make sure of this? Just turn it on safe mode.

In that Android mode launches only system applications, so you can immediately understand whether the problem is with the application 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.

Problems with the SIM card

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.

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 generation code used to connect the user and 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. To begin with, you should try to fix the problem yourself, but if this fails, then it’s time to seek help from mobile operator. 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, this is most likely due to the fact that this brand gadgets are 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 are experiencing connection errors on your Android, then open the 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 need to contact the cellular 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 a third party is at fault software 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.