Fix Connection Problem or Invalid MMI Code Error on Android

Fix Connection Problem or Invalid MMI Code Error on Android

Are you getting a “Connection Problem or invalid MMI code” message whenever you enter an MMI code?

The Man-machine Interface also called MMI code is used to enable/disable features. It is also used to provide information about the phone to the user.

When an invalid MMI code message is shown that means you will be unable to make calls or text messages and it could be frustrating.

However, this error can be solved with some fixes.

So, in this guide, we have discussed all the possible solutions that can eventually help you solve Connection problems or Invalid MMI code errors on Android.

Before moving to the solutions, let us see what are the common reasons that can cause this error to appear on your phone screen.

Causes: Why Are You Getting “Connection Problem or Invalid MMI Code” Error?

Invalid MMI code is a mobile Network error and sometimes it is caused by to network glitch.

Virus-containing apps and SIM malfunctioning can also be the reason behind this error.

Now that we are familiar with the reasons causing this issue, we can move further and see the solutions to this problem.

How To Fix “Connection Problem or Invalid MMI Code” Error on Android

Fix 1: Restart Your Phone

The first thing you could do is restart your phone.

It is the simplest yet effective method to solve any type of error or glitch that is causing problems.

All you need to do is press and hold the power button until the restart and other options appear on the screen.

Then tap on the Restart option and wait for the process to complete.

Then check if the error is still appearing or not.

Fix 2: Turn ON/OFF Airplane Mode

Due to a network glitch, this error may be showing and by turning Airplane mode ON and OFF your device will be refreshed.

You have to swipe down the screen from the top to open the control panel.

Then switch ON Airplane mode wait for 15 seconds and switch OFF it.

Then again check whether you are getting the message or not.

Fix 3: Disable Another SIM (If You Have Dual SIM)

Dual SIM can also cause MMI code errors.

If you have a dual SIM, then you have to turn OFF another SIM that is not in use.

Here’s how you can do it:

Step 1: Go to Settings.

Step 2: Tap on Connections > SIM manager.

Step 3: Then disable the other SIM and tap “Turn off” to confirm.

Turn off SIM

Fix 4: Put a Comma (,) At The End Of The Code

Sometimes invalid MMI code errors can be fixed by just simply adding a comma at the end of the code.

For example, you want to dial this code – *#06#

Then just add a comma and enter *#06#, instead.


Fix 5: Set Network Mode To Auto

By setting Network mode to auto, you will be able to connect to any network mode automatically.

Sometimes the network mode you have enabled may not be available in your current location and it may cause an error.

So, you don’t have to change the network mode repeatedly once it is on auto-connect mode.

Follow the given steps to set the Network mode to auto:

Step 1: Go to Settings.

Step 2: Tap on Connections > Mobile networks > Network mode.

Step 3: Now select 5G/LTE/3G/2G (auto connect).

Mobile Network

Fix 6: Boot Your Phone into Safe Mode

If you have recently downloaded any third-party apps, it might be possible that it is causing the connection problem or invalid code error on your Android.

In that case, check this possibility on your device in Safe Mode.

Here’s how to do so:

Step 1: To open the Power menu, press and hold the Power button.

Step 2: Now you have to long press on the Power off option.

Step 3: Then tap on the Safe Mode option.

Now your device will enter into Safe Mode. After entering the Safe Mode, dial the MMI code and check if the error is fixed or not.

If the error is solved, it is confirmed that the third-party app might be the cause of the invalid MMI code error.

So, in this case, restart your device to exit Safe mode, uninstall the recently downloaded app one by one and check connection problem or Invalid MMI code error is solved or not.

Fix 7: Enable SMS Over IMS

Enabling SMS over IMS helps your Android phone receive and send SMS over an IP-based network.

And it can also help mitigate compatibility issues.

Here are the steps to do so:

Step 1: Open the Phone app and dial “*#*#4636#*#*” and a service menu will appear.

Note: Code can differ based on your phone so you are suggested to search it on Google or contact your carrier and device manufacturer.

Step 2: Tap on Phone information > RUN PING TEST.

Step 3: Then tap on Turn Off Radio and Turn on SMS over IMS.

Phoone Info

Then Restart your device and check if the error is still shown on the screen or not.

Fix 8: Reset Network Settings

If none of the above methods worked then you should reset the Network settings on your device.

Here’s how to do so:

Step 1: Go to Settings.

Step 2: Tap on General Management> Reset > Reset network settings.

Step 3: Lastly tap on the Reset settings to confirm.

Reset settings

Now check whether the Connection problem or Invalid MMI code error is fixed or not.

Wrap Up

Invalid MMI code error usually occurs due to mobile network errors.

If you are also facing this error then read this article on how to fix the Connection Problem or Invalid MMI Code error on Android.

In this guide, we have provided all the possible solutions to help you resolve this problem.

I hope you have followed the steps carefully and were able to solve the Invalid MMI Code error.

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