How To Fix Connection Problem Or Invalid MMI Code On Android Device(2021)

If you are also an Android user, then you too must have faced this “Connection problem or invalid MMI code” problem, which becomes quite frustrating. When you face this problem, you will neither be able to message anyone nor call from your Android phone.

There are several ways to get out of this problem, by which you will be able to fix this Connection problem or invalid MMI code and will be able to call and text messages from your Android phone again.

What is MMI code?

The full form of MMI is Man-Machine-Interface. An MMI is a software that provides a piece of specific information by dialing the sequence of a specific number of the customer in his phone.

These MMIs expect and execute the customer’s control commands and display them in a graphic format in front of the customer. In simple words, the number that starts with * and ends with # is called MMI.

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How To Fix Connection Problem Or Invalid MMI Code On Android Device?

This problem can be caused due to which can show an error in your Android phone, but it is generally seen that the problem of a Connection problem or invalid MMI code is seen more in LTE smartphones than in VOLTE.

If you also use an LTE Android phone and have selected LTE only in Internet Settings, then you print an error of invalid MMI code. Below we have mentions some points which will help you to get rid of this problem.

1. Restart Your Android Device

You must have often heard that if there is any small or big problem in your Android smartphone, such as a phone hang or invisible MMI code, then you must first check it by retesting it.

Most of the problem that was coming to your phone by restarting, is automatically fixed because when the phone is restarted, it configures all its programs and fixes it. So in this problem, you must restart your phone before taking any other step.

2. Enter Safe Mode

As all smartphone users will know that after putting the phone in safe mode, all the default applications and services in it are closed and debug which helps in finding your culprit application.

There is no default feature in the phone to turn on the safe mode, for this, you first have to switch off your smartphone, then press and hold the power button while turning it on, and keep pressing the menu button evenly. Until you do not have the option of safe mode in front of you.

3. Activate Radio to Turn on IMS over SMS

Activate Radio to Turn on IMS over SMS is another way by which you can fix the connection problem or invalid MMI code. Just follow the steps given below.

  • Go to the dial pad of your smartphone and dial *#*#4636#*#*.
  • Take care that you do not press the send button after dialing the number. This will automatically show you the service mode.
  • After that, you need to select “Device information”.
  • Hit the ‘run ping test’ option.
  • Finally, select the Turn Radio Off option, and you are done.
  • Now, reboot your device.

4. Restart Your Android Phone Several Times

Sometimes it happens that your phone is not able to detect the problem by rebooting once, so it is advised that you restart your phone multiple times and in many cases, it has been seen that connection problem or invalid MMI The problem with the code is resolved.

You have another option to turn on your locked phone and go to the network settings. After this, hold the power button and home button together until the phone goes off.

5. Check Network Settings

This error with the MMI code comes more to dual sim users as it is a network problem. Follow the steps given below to know your device’s network settings.

  • Go to your phone’s settings.
  • Then, tap on the ‘network connection’ option.
  • At that point, “Organization Operators” and select remote suppliers during the pursuit.
  • Associate again for another 3-4 endeavors before it begins working once more.


Basically, we learned in this article what is MMI code and how to fix connection problems or invalid MMI codes on Android devices? All this is a common problem that comes in the life of every smartphone user. Hopefully, after reading this article, you get rid of such problems.


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