Aug 23, 2024 · Do you keep getting the ‘Connection problem or invalid MMI code’ error while dialing MMI code on your Android phone? Here's how to fix it.

Feb 21, 2024 · Getting an error message that says “Connection problem or invalid MMI code” on your phone can be frustrating, right? But don’t worry, you can fix it without pulling your hair out. …

Oct 12, 2025 · Fix “Connection Problem or Invalid MMI Code” errors on Android devices with updated step-by-step solutions including Safe Mode, cache clearing, SIM checks, carrier …

Nov 14, 2023 · Getting an error every time you enter an MMI code? Here's what you can do to fix it.

Feb 11, 2024 · Android’s “Connection problem or invalid MMI code” error prevents you from dialing your network-specific codes and getting relevant information. If the issue persists even …

Sep 13, 2023 · 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.

Mar 24, 2025 · Fix the 'Connection Problem' or 'Invalid MMI Code' error on your Android phone with this step-by-step guide. Learn how to disable VoWiFi and VoLTE.

Apr 6, 2023 · Android users have reported the MMI code error when they try to send a text or make a call. An error message “Connection problem or invalid MMI code” is displayed on the …

Aug 15, 2024 · Here are all of the most effective ways to fix an invalid code MMI error warning and prevent it from happening again. It’s best to work through these in the order presented, as …

Jun 12, 2025 · In this article, we bring you the top 10 ways to fix the 'Connection problem or invalid MMI code' error on your Android smartphone.