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Invalid mmi code
Hello I Installed the sim in my phone and im getting invalid mmi code when I dial ##72786# How do I resolve this no connection issue and for apn its fp.com.attz for mms its fp.com.attz I read something about the router Application Layer Gateway SIP ALG option must be disabled to allow incoming calls even when WiFi is enabled on the phone. Is this really important because I dont have access to the router settings currently its password locked and I cant change it because im currently locked out of the router options I dont know the password... The phone is a xiaomi redmi 4a phone unlocked...