Of course, not supporting normal SIMs and GSM networks could just be a colossal mistake. We'll find out when the next version of iPhone Baseband and Modem firmware is released. If you have access to the iOS developer program, I'd love to know if the Beta of 5.1 fixes your problem .... Thanks for the insights, what you write makes some sense. As I wrote, I wasn't sure whether it was the new SIM or the tape. However, here's where I'm lost. I cut my wife's SIM down to a uSIM as well, and she's not experienced any problems. So it would seem that it is a combination of SIM and iOS version. I (and more importantly she) don't feel like testing it out by updating her OS to 5.0.1 to see if she starts experiencing the problem. I'm i...