How to Fix Connection Problem or Invalid MMI code on Phone?

Today, I will Show you How to Fix Connection Problem or invalid MMI Code on Phone.
If you follow my all Steps without Skipping, you will be able to Fix Connection Problem or invalid MMI Code problem on Phone. It is very easy System.
Watch this Video to Learn how to Fix Connection problem or invalid MMI code on Phone .
#Fix#Connection#problem#invalid#MMI

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I follow this step right now but still my stc nimber not working