I unlocked my iPhone today and got a popup saying "No SIM card installed," and "AT&T" was replaced with "No SIM" in the top left. I couldn't call people or anything. I turned my iPhone off and on and that fixed it for a few hours, but then it did the same thing again. Restarted it again, fixed for a few hours, messed up again. I'm using a last-gen iPhone with 2.0.2, which wasn't jailbroken today when the problem started but I just pwned it an hour ago. The third time the message popped up was about 15 minutes after it was pwned.