My Samsung Mobile get Invalid MMI Code How to fix this issue

Samsung All Phone & J2 - Connection Problem or Invalid Mmi Code Problem Solve: The first way to try to fix an invalid MMI code would be to restart the smartphone. Going to network settings and then holding the #Power” button and the #Home” button at the same time until the phone turns off and starts vibrating will restart the smartphone.
Dial: "*#21#" This code on your phone to fix this problem.
MMI code is the code that we enter over the phone which contains * and hash # characters. Solution: 'Connection problem or invalid MMI code' indicates a problem with the network (i.e poor signal) or wrong MMI code have being entered by the user

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