Textnow sim not working moto g5 plus8/10/2023 ![]() ![]() T here are a lot of users who have found a solution by deleting an app that may have been causing the MMI code error. The best option, to begin with, is disabling some third-party apps. See also - Why does my phone say no service? Ways to Fix Connection Problem or Invalid MMI Code Method 1: Third-Party App The error pops up when the provider has some problems with the network or when there are SIM authentication issues. While the country's cell phone providers vary, invalid MMI code errors are usually found on dual SIM smartphones. What causes Connection Problem or Invalid MMI Code? ![]() You usually see this error when you are about to check your account balance, top-up, recharge, or perform any function designed by your SIM service provider, like adding a voucher to run a USSD code. One of the problems that may pop up is a connection problem or an invalid MMI code. Android phones are great, but you may face some issues from time to time. ![]()
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