Since i moved from 3g to 4g and activated the sim i have to keep entering the 7890 every time i power the phone on.
I also keep getting 'no service' in the signal bar and have very poor quality signal most of the time, is this usual for 4g? or has something gone wrong with moving over?
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Can't say about the signal, but the need to enter the unlocking code can be turned off on your phone. On my Android it is Settings > Security > SIM Card Lock Settings
Would this not get rid of sim protection all together? When phone is in use and need to enter the pin i set so no one can access it?