It says there is a problem connecting the mmi code. Correct incorrect MMI code if there are connection problems


When you try to make a phone call or send an SMS, you may see a message about a connection problem on your phone screen. This error may also appear when checking your balance on your phone or tablet. In our article we will tell you how to do certain manipulations to restore communication.

MMI code is a request from a mobile device that contains an asterisk and a hash in its symbols. This kind of combination of characters is used by users for official operations. MMI code is executed on mobile devices and tablets, with any operating system. Let's look at 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 a 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 network coverage stability.

To correct the error, you need to go to your phone settings.
Then go to the “Mobile network” or “Network mode” tab and select the “GSM only” network mode.

For the settings to take effect, you must restart the phone. The connection or MMI code error should disappear.

It happens that when you try to call, send an 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 tell you what this problem of incorrect MMI code is, and also share the best methods on how to fix connection problems or incorrect MMI code, making sure that your Android phone works for a long time and reliably.

Code MMI(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, top up the account, connect or disconnect any service, switch to another tariff plan, and so on.

Typically, the MMI code begins with an asterisk and ends with a hash; for complex queries, an asterisk is also used as a separator.

Connection problem or invalid mmi code - causes and solutions

This error can occur on different mobile operators and on 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 the mmi code appears suddenly, and just as suddenly it can disappear, leaving the user at a loss about the real sources of its occurrence. Below I will list a list of existing causes of the problem, and also talk about ways to troubleshoot the problem.

Unstable operation of the operator's 3G networks

The operation 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 incorrect MMI code, simply disable the 3G connection for a while, giving your operator time to fix the problem.

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

One of the most common problems. If your SIM card has been in use for many years, or is often removed and inserted, then it may lose its functionality due to wear and tear. Try connecting it to another phone and checking its functionality. If another phone has a similar problem with an incorrect MMI code, then you can try wiping 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 or malfunctions may cause a problem - connection problems or incorrect MMI code.

  1. Try rebooting the device, and if the problem persists, try performing a full data reset.
  2. Go to “Settings” - “Backup and reset” - “Reset data” - “Reset device” (aka “Settings” - “Backup” - “Reset data”).

Temporary problems with the mobile operator

In this case, all you have to do is wait. You can call the operator and find out how long the error with MMI will persist.

Some applications work

Some externally downloaded applications may cause an error with connection problems or an incorrect MMI code. To confirm or refute this suspicion, boot your device in safe mode and try to make a request to the operator. If it goes well, it means that some new application installed on the phone is to blame and will need to be removed.

Find out how on your device on the website of the manufacturer of your gadget. On mine, Samsung, it’s done like this.

  • First you need to turn off the device, then press its power button, and after the device turns on, you need to hold down the “Volume Down” button for a few seconds (while the developer logos are being displayed).
  • After these steps, your smartphone (tablet) will boot into safe mode (you will see a message about this at the bottom of the screen), and you will be able to test its operation.

Conclusion

As we can see, connection problems and incorrect MMI code are usually caused by instability of mobile operator networks, as well as physical wear and tear of the SIM card. The problem may be caused by incorrect phone settings, as well as third-party applications that can cause malfunctions in the operation of the mobile device. If you see a similar error, then first of all, try contacting your mobile operator - it is quite possible that the reason is not yours, but his.

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, then you should remove them and try again.
  • If the user is behind outside the 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.

If, when you try to make a call, send an SMS or make a request for account balance, a message about a connection problem and an invalid MMI is displayed on the phone screen, then you should do simple manipulations to restore the connection. There is nothing complicated about them and even an inexperienced user can perform them.

The MMI (Man-Machine Interface) code is used to generate a USSD request from the keyboard of a mobile device. It starts with an asterisk and ends with a hash. When performing more complex queries within code, an asterisk is used to separate parameters.
We usually use such combinations when requesting information about balance, expiration date, when replenishing an account, etc.
Sometimes, when performing such a request, an error is displayed on the screen: “Connection problem or invalid MMI code.”
Below are some ways to resolve this error:

1. Problem with the SIM card

Like all electronic products, the SIM card is subject to physical wear and tear and may not function correctly. To correct the connection error, you must contact the service center to replace the card. However, the phone number will remain the same. It is recommended to replace the SIM card every 2 years.

2. Insufficient coverage or unstable 3G operation
Mobile operators are constantly improving their coverage capabilities and using third-generation 3G communications, but it does not always work as expected.
Modern telephones are also prone to modernization. For this reason, by default they use the ability to automatically connect to GSM/WCDMA. But with 3G connectivity interruptions, this network is not always stable.
To eliminate the error when there is insufficient coverage, you need to set the GSM network as follows:
- go to the phone settings;
- then go to the “Network” menu and select “Mobile networks”;
- in the “Network mode” setting, change the network mode to “GSM only”;
- reboot the phone.
This mode does not have to be changed permanently. After a while, try turning on the previous network mode again.
3. Some applications work

Some externally downloaded applications may cause an error with connection problems or an incorrect MMI code. To confirm or refute this suspicion, boot your device in safe mode and try to make a request to the operator. If it goes well, it means that some application installed on the phone is to blame and will need to be removed.

4. Problems with device settings
Incorrect device settings or malfunctions may cause problems with the MMI connection.

Try rebooting the device, and if the problem persists, try performing a full data reset.
Go to “Settings” - “Backup and reset” - “Reset to factory settings”. Please note - all data on the device will be lost!
5. Temporary problems with the mobile operator
In this case, all you have to do is wait. You can call the operator and find out how long the error with MMI will persist.

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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 your account balance, tariff plan, etc.

Factors influencing the occurrence of the error:

  • Incorrect 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.

Note! 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.

Note! 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 the 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 strength affects the appearance of the MMI error 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 in case of physical damage (even minor). 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 the device, change the network type, or add a character to the USSD code you send. As a last resort, you need to replace the SIM card.


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