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

May 16, 2025 · Here are a bunch of secret MMI and USSD codes that can unlock hidden settings, features, and information on your Android phone and tablet.

Oct 14, 2025 · These secret codes, known as USSD (Unstructured Supplementary Service Data) and MMI (Man-Machine Interface) codes, give you direct access to system information, testing …

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.

Jul 29, 2025 · MMI (Man-Machine Interface) codes are special codes you can dial on your Android phone’s keypad to access hidden menus, test features, or get detailed information …

May 5, 2024 · MMI codes, short for Man-Machine Interface codes, are brief sequences of symbols that can be entered into a smartphone’s dialer. These codes enable users to access hidden …

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 …

Nov 12, 2025 · This wikiHow article teaches you all the MMI codes for Android you could ever need. [1] To Use MMI codes on your Android, open the Phone app and display the dial pad. …

Oct 2, 2025 · MMI stands for Man-Machine Interface code, a set of special codes entered on mobile phones to interact directly with the network or SIM card. MMI codes are commonly …

Oct 12, 2025 · An MMI (Man-Machine Interface) code, often called a USSD code, is a string of numbers and symbols used to access carrier or device functions (for example checking …