![]() These codes are often initiated by dialing a special character like "*" or "#," followed by the code and ending with another special character Common reason behind 'Connection Problem or Invalid MMI Code' Errors" What is an MMI Code?Īn MMI ( Man-Machine Interface) code, also known as a USSD ( Unstructured Supplementary Service Data) code, is a sequence of numbers and symbols that you can dial on your mobile phone to access specific functions or services provided by your mobile carrier. Let's dive in and resolve these connectivity issues together. Whether you're a tech-savvy user or just looking for a quick fix, we've got you covered. ![]() In this guide, we'll explore what causes these problems and provide you with step-by-step solutions to get your phone back on track. These issues can be frustrating and may disrupt your ability to make calls or access certain services on your device. Are you facing a connection problem or seeing an 'Invalid MMI Code' error on your smartphone? You're not alone.
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