Web Reference: 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. 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 this problem. Feb 21, 2024 · Dealing with a “Connection problem or invalid MMI code” error can seem daunting, but it’s usually a simple fix. Whether it’s a network issue, a typo, or a software glitch, following the steps outlined in this article should get you back up and running in no time.
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