Fix Android MMI Code Guide

 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.

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