What is an invalid mmi code

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Various types of errors can occur when executing USSD requests. Very often it happens that after sending a request a message appears on the screen "Connection problems or incorrect MMI code". MMI is the query code with which the user and operator are connected. Sometimes this process fails and you get an error message. We will talk in detail about how to fix this problem in our article.

The method to correct the error "Connection problems or incorrect MMI code."

Causes of failure

Such a phenomenon can appear in your phone due to incorrect settings or SIM card malfunction. First of all, you should try to fix the problem yourself. However, if this was not possible, you should ask the mobile operator for help. An invalid MMI code can be displayed when using any operator: MTS, Beeline or Megaphon. The brand of the device also has no influence on this process. However, it should be noted that this problem is more common on Android devices, especially those made by Samsung. However, this is most likely due to the huge demand for this brand of equipment.

Invalid MMI code: how to fix

Method 1. Repeat the request. Sometimes an error message appears when you enter a request, but there are no communication problems. In this case, try typing again after a while, as your operator is most likely to be responsible for the error.

Method 2. Turn on airplane mode. Airplane mode can disable many features. If you have any errors connecting to your Android device, open the control panel and switch Airplane Mode to the active position for a few seconds. Then turn it off. After this operation everything should fit together.

Method 3. Restart the smartphone. If turning on airplane mode didn't help, restarting the device can fix the connection problem or an invalid MMI code. Restart or turn the gadget on and off and check for an error.

Method 4: change the network type. Modern devices can work with 4G connection. However, it does not always work stably on Android. You can understand this by changing the label next to the communication strips. The question arises - what to do? In such situations you need to change the network type:

  • open settings.
  • Go to "Wireless Networks" - "Mobile Networks" - "Network Type".
  • Select the 3G option if it doesn't meet the requirements of your region, then select 2G. Then everything can be brought back to the right place.

Check if your queries are working now.

Method 5. Change the SIM card. Sometimes the SIM card is damaged and loses its main function. In this case, you will need to contact the mobile center to get a new card. Contacts on your old SIM card and those not saved in the phone memory will be deleted. If you bought a new SIM card but the error keeps coming up, check to the end that you have inserted it into the appropriate slot. You can also reinsert the card. You can also check the quality of your work on another smartphone.

Method 6. Put the phone in Safe Mode. Sometimes third party applications can affect some processes in the device. In order to determine whether or not the "Alien" program is to blame, you need to enter Safe Mode. Press and hold the phone off button to start. Then hold your finger on the point "Shutdown" in the menu that opens. A dialog box will appear informing you that you have entered Safe Mode. After you click OK, your phone will start. Only system programs are displayed. Hence, you can determine if third party software is to blame or not.

If none of the above methods worked for you, contact your network operator. Most likely, there is work going on on the server.

Hope our article helped you. If you have any questions, ask them in the comments.