I activated my Iphone4 and it pronounced no sim found. I took the sim out put it behind in and the phone worked. Five mins after pronounced no sim. Took it to the AT&T store and had a latest sim put in. The phone worked for a couple of mins afterwards went behind to no sim. Spent a couple of hours on home phone with apple. Tried reset though still happening. No answers from apple. Has any one else had this happen?