Everything worked great on my Lumia 920 until today. I hooked up my Lumia 920 to some speakers through the head phone jack. All I could hear was some pulsating coming from the phone. So I unplugged the speakers and plugged it back in which caused the phone to reboot. After it restarted it showed a message that my SIM card is blocked. Now the phone requires a PIN unlock key from AT&T before I can make calls again. How is that even possible that a phone crash can cause such a disastrous SIM card error.
Did anyone else experience this problem.