Hi, I just purchased a new 3GS and it intermittently has problems sending and receiving calls and txt's. I thought it was the service, but my girlfriend just received her phone and it sends and receives perfectly fine. I called ATT and they walked me through turning the phone off/on, resetting the network settings, and also made me turn airplane mode off/on. would work for a couple minutes and then it would stop. the txt would go to about 90% and then would fail. I also try to resend it and then it fails again. Gave it a couple minutes and it would work again. I swapped the sim and put it in my gf's phone and it works fine. Now with her sim in there she would experience the same issue. I'm leaning towards the phone causing the problem. Anybody else experience this issue??