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![]() ![]() Android USSD Codes: MMI Code List Samsung USSD Codes (Restart) To address this, ensure that you've entered the correct code and that your phone has a stable network connection. This error typically occurs when you input a code that the system doesn't recognize or when there's an issue with your network connection. If you encounter an " Invalid MMI code" error on your Android device, don't worry there are steps you can take to resolve it. What if I get an "Invalid MMI code" error ? MMI codes are entered like telephone numbers to obtain a variety of information and enable and disable various actions. ( Man-Machine Interface code) A cellphone code begins with a star/hash (*#) prefix. Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes," is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers. This usually happens because of barriers created by carriers to restrict certain codes. ![]() While some are generic, some may only work on specific devices. ![]() These codes were tested on a Samsung Galaxy phone. One of the most important uses of these android codes is to troubleshoot common problems and other useful testing and debugging purposes. We have a collection of the full MMI and USSD Code lists for iPhone and Android (Samsung Included). ![]()
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