How To Fix Connection Problem Or Invalid MMI Code Error?

For Android users, the notice “Connection problem or invalid MMI code” that occasionally appears can be annoying. The incorrect MMI code notice typically indicates that you are unable to send or receive texts or calls until the problem is fixed. Thankfully, several approaches could resolve the Android “Connection problem or invalid MMI code” error. Try the options listed below. Continue with the following process if the first one fails to solve the invalid MMI code error on Android.  

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What Is An MMI Code?

It can be challenging to determine the function of each code and number on a SIM-compatible gadget because there are so many of them. The Man-Machine Interface (MMI) code, that begins with an asterisk (*) or pound (#), grants users powers to set or turn off different star code features (*#06#, like, to show IMEI). 

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Why Does an Invalid MMI Code or Connection Problem Occur?

A mobile network error known as an incorrect MMI code can be caused by several reasons, including connectivity problems and authorization problems. Your phone might display the prompt “Connection problem or invalid MMI code” for several reasons. This happens due to an issue with the smartphone’s SIM authentication or a issue with the carrier provider. For phones that support dual SIMs, the mistake is very typical, but it can also happen with other phones.

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How To Fix Connection Problem Or Invalid MMI Code Error?

Fix 1: Reboot Your Android Smartphone In Safe Mode

The first method you need to follow is to reboot your smartphone in Safe mode and check if you are still facing the invalid MMI code error on Android. Here are the steps:

Step 1: Long press and hold the Power button till the Power Menu arrives.

Step 2: Now long tap on the Power Off icon.

Step 3: Finally you will see the Safe Mode icon. Tap on it to boot your phone into safe mode.

Step 4: Try calling an MMI code one more time after putting your phone into safe mode. 

If you don’t experience any issues, your phone’s third-party apps are probably to blame. It’s more likely that recently installed apps are to blame for the issue. To permanently fix the problem, think about deleting such programs one at a time.

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Method 2: Network Reset

The next option to fix an invalid MMI code error on an Android issue is to reset the network settings on your Android. Here are the steps that you need to follow:

Step 1: Launch the Settings app on your phone.

Step 2: Tap the General Management option and then tap on the Reset option.

Step 3: Under Reset, tap on Reset Network Settings.

Step 4: Once again tap on the Reset Settings in the next screen.

Step 5: Adhere to the onscreen directions and follow them. 

Now check if you are still facing the MMI code started error. 

Also Read: SIM Not Provisioned Error Message on Android

Method 3: Select Auto In Network Mode

It is recommended by experts to let your Android phone choose its network. Here are the steps to fix an invalid MMI code error on the Android issue. 

Step 1: Launch the Settings app and look for the Connections option and tap on it.

Step 2: Next look for Mobile Networks and tap on it.

Step 3: You need to hit the Network Mode option and choose 5G/LTE/3G/2G (auto connect).

Step 4: Exit this setting and wait for a while for your mobile phone to connect to the strongest network.

Check if you’re still facing the MMI code started error again. 

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Method 4: Enable & Disable the Airplane Mode

Your phone’s network connections can be refreshed by turning airplane mode on and off. Toggling airplane mode should help if the “Connection problem or invalid MMI code” error is only occurring because of a network issue. 

Step 1: Open the Settings app and select Connections. 

Step 2: Then switch on Airplane mode using the toggle. 

Step 3: When you’re ready, turn it off after a brief delay. 

Step 4: Then, try calling an MMI code one more time to see if it is successful. 

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Method 5: Disable The Secondary SIM

These MMI code problems are typical of Android phones that support two SIM cards. If that applies to you, try deactivating the other SIM and see if that helps end the ‘MMI code started error.’

Step 1: Launch the Settings app and select Connections. 

Step 2: Select SIM management, turn off the toggle next to the empty SIM card, then choose Turn Off to confirm.

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The Final Word On How To Fix Connection Problem Or Invalid MMI Code Error?

The invalid MMI code error on Android on your phone can be fixed using a few different techniques. Notably MMI faults affect dual-SIM phones, but this has also been observed in single-SIM phones because of weak signals or tower network issues. Contact your service provider for help if the above-mentioned fixes don’t help you.

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