So just go through some of the possible solutions that can help you to resolve this connection problem or invalid MMI code error. When you use carrier provider’s activity like calling, texting, checking your phone’s balance, recharging through airtime etc. This error could be due to SIM authentication or issues with your carrier provider.Īlso this error is most common in dual SIM devices and especially in Samsung smart phones like galaxy’s duos, galaxy grand etc. Most common form is when you try to call someone an error flashed in your screen saying connection problem or invalid MMI Code. Sometimes you cannot even recharge your phone through airtime. ![]() This error won’t allow you to call or text anyone.
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