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.

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 …

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 …

Feb 21, 2024 · Struggling with connection issues or invalid MMI codes? Follow our step-by-step guide to troubleshoot and fix these common problems.

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 …

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.

Nov 7, 2025 · Understanding these causes is the first step toward troubleshooting and, hopefully, resolving the issue. The Mobile Station International Subscriber Directory Number (MMI) …

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.

Nov 14, 2023 · There's a chance your Android device has run into the "Connection Problem or Invalid MMI Code" error due to a temporary network mishap. Most of the time, refreshing the …

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.