![]() ![]() The first way to try to fix an invalid MMI code would be to restart the smartphone. We’ll cover them from the simplest method up to the more complicated ones. Several methods exist to fix the “Connection problem or invalid MMI code” on an Android device. The error is quite common for phones with dual-SIM capabilities, but it does occur on others too. ![]() The main reason is an issue with the carrier provider or problems with the SIM authentication on the smartphone. There are several reasons why the “ Connection problem or invalid MMI code” error message appears on your phone. 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). What is an MMI Code?Īny SIM-compatible device has a plethora of codes and numbers it can be difficult to identify the purpose of each one. If one process fails to resolve the problem, move on to the next one. This can occur for many reasons.įortunately, there are several ways to potentially fix the Android “Connection problem or invalid MMI code” error. When the invalid MMI code message appears, it generally means that you can’t make calls or text messages until the issue gets resolved. Sometimes, a message saying “Connection problem or invalid MMI code” shows up and can be frustrating for Android users. ![]()
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