September 13, 2023
Sometimes, a message saying “Connection problem or invalid MMI code” shows up and can be frustrating for Android users. When the invalid MMI code message appears, it generally means that you can’t make calls or text messages until the issue gets resolved. This can occur for many reasons.
Fortunately, there are several ways to potentially fix the Android “Connection problem or invalid MMI code” error. Try the following options below. If one process fails to resolve the problem, move on to the next one.
Any SIM-compatible device has a plethora of codes and numbers it can be difficult to identify the purpose of each one. An MMI code (Man-Machine interface code) begins with an asterisk (*) or pound (#) sign that lets users enable or disable various star code functions (*#06# to reveal IMEI, for example).
There are several reasons why the “Connection problem or invalid MMI code” error message appears on your phone. The main reason is an issue with the carrier provider or problems with the SIM authentication on the smartphone. The error is quite common for phones with dual-SIM capabilities, but it does occur on others too.
Several methods exist to fix the “Connection problem or invalid MMI code” on an Android device. We’ll cover them from the simplest method up to the more complicated ones.
The first way to try to fix an invalid MMI code would be to restart the smartphone.
It’s possible that third-party software is interfering with your connection and causing an MMI error. Fortunately, it’s easy to rule this out. Here’s what to do:
If your phone doesn’t throw any error codes, third-party software is interfering with your network. You’ll need to start removing third-party apps. Start with the applications you installed around the time you started seeing the error.
When you follow the Settings>Apps path scroll down and uninstall any apps you believe may be the culprit. Then, power your phone out of Safe Mode and see if the error appears. Keep doing this until the MMI code ceases.
Some users have had success using Airplane Mode to resolve their MMI code error issues.
Given that an MMI Code error can occur due to weak signal strength performing this can reset your connection and correct the error.
Because we know that the MMI error indicates an issue with your device’s cellular connection, the next logical step is to reset your Network Settings. Perhaps your network settings haven’t updated properly or there’s a glitch in the system. Performing a network reset will clear any problem codes and help you start fresh. Here’s what to do:
When your phone powers back up, the error should disappear.
Another way to fix the Connection Problem or Invalid MMI Code on an Android smartphone would be to add a comma at the end of the Prefix code. When a comma gets added, it forces the operation to execute and overlook any error.
Below are two different ways to modify the prefix code.
Hopefully, your MMI error is gone by this point. But, if you still have questions, keep reading.
If you’ve tried all of the fixes above and the error continues, you may need to contact your cell phone carrier for more information. They may recommend a new SIM or they can resend OTA (over-the-air activation).
In closing, there are a few methods/options you can use to remedy the MMI error on your phone, some a little more involved than others. While most MMI errors occur on dual-SIM phones, they also appear on phones with one SIM due to weak signals or tower network issues. If the above solutions don’t work for you, contact your service provider for assistance.
Disclaimer: Some pages on this site may include an affiliate link. This does not effect our editorial in any way.
Dominic Anderson March 14, 2025
Dominic Anderson December 27, 2024
Dominic Anderson September 18, 2024
Supreeth September 6, 2024
Supreeth September 4, 2024
Supreeth September 2, 2024
Afam Onyimadu August 29, 2024
Afam Onyimadu August 28, 2024
Afam Onyimadu August 27, 2024
Supreeth August 26, 2024
Afam Onyimadu August 22, 2024
Afam Onyimadu August 20, 2024
Afam Onyimadu August 15, 2024
Afam Onyimadu August 13, 2024
Afam Onyimadu August 9, 2024
Supreeth August 7, 2024
Afam Onyimadu August 3, 2024
Afam Onyimadu July 30, 2024
Supreeth July 29, 2024
Afam Onyimadu July 26, 2024
Afam Onyimadu July 25, 2024
Afam Onyimadu July 16, 2024
Afam Onyimadu July 9, 2024
Afam Onyimadu June 7, 2024
Dave Johnson June 4, 2024
Afam Onyimadu June 1, 2024
Afam Onyimadu May 30, 2024
Mehvish Mushtaq May 20, 2024
Afam Onyimadu May 15, 2024
Mehvish Mushtaq May 11, 2024
Mehvish Mushtaq May 6, 2024
Afam Onyimadu May 1, 2024
Dominic Anderson June 23, 2025
Dominic Anderson June 20, 2025
© Guiding Tech Media 2025
About Us | Contact Us | Privacy Policy | TOS | All Rights Reserved