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If the Connection Problem or Invalid MMI Code problem is driving you nuts, we got a few solutions that should solve your issue.
Some MMI codes are manufacturer dependent, and if you have a Samsung smartphone, you should see our guide to access the hidden Samsung Galaxy diagnostics menu and a list of secret codes for the ...
Discover the best secret codes for Android to unlock hidden features and diagnose your smartphone. Find IMEI number, test GPS, perform factory reset.