Meyne Koehler

Good notes are required in a live class.If you're learning a new skill, you should make sure you build projects in it.If you are learning to code, pause the video and build something with what you've learned.If you're learning to play an instrument, it's a good idea to play a few songs.Etc.I think the practice cycle is the best way to learn about a topic.

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 interferring 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).

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