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 12, 2025 · Below is a clear, step-by-step guide to help you understand what MMI codes are and how to resolve this error, whether it’s caused by your SIM, carrier, or phone settings.

Jul 29, 2025 · What Are MMI Codes? MMI codes are sequences starting with * or # and ending with #. They interact directly with your phone’s firmware or network services. Some codes are …

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.

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. …

Aug 15, 2024 · Android MMI invalid code warning messages usually arise from issues with the SIM card, mobile network, apps, or the code itself. Here are over a dozen tested ways to fix …

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 …

Mar 5, 2024 · MMI stands for Man-Machine Interface, and it refers to a set of codes that can be entered on Android smartphones to access hidden menus, retrieve device information, or …

(M an M achine I nterface code) A cellphone code that begins with a star/hash (*#) prefix. MMI codes are entered like telephone numbers to obtain a variety of information as well to enable …