I have the phone for about 2 weeks now, with 3-4 hours daily use. In the middle of a call this morning, it went silent and when turned on again, it displayed "SIM card removed. Reboot phone". I took the card out and put back in 3 times, but it still happens. Wi-Fi is working, phone is still running apps. I tried to press the SIM card tightly while trying to connect, but it's no good. A quick Google search does not show many people with this problem. Anyone has a quick solution before I call ATT or Samsung? Thank you for reading my problem.