So after upgrading to the iOS 7 GM this afternoon, I tried to activate the phone. Just like everyone else, I was having troubles. But I think mine are a little different. I eventually, got a message that has me a little baffled. It says "SIM Not Valid - the SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information." From the message I figured, maybe my SIM card went bad or something. I swapped the SIM out with my wife's phone, and hers gave the same message, but my SIM also works in her phone. So, I take my phone to Apple, and they seem confused about this message. They immediately swap my phone thinking it is a hardware issue. The new phone came with 6.1.4 and activated right away. So I go home. At home I figure, well since it activated with the other version. Lets give this a shot again. As soon as I update to iOS 7 it gives me the same error. I have no idea what to do at this point. I'm going to go into AT&T tomorrow, but I'm thinking that might be a waste of time. Has anyone had this same issue? I guess I could raise enough hell tomorrow at AT&T to get this resolved but I was wondering if someone had a solution. I've done DFU restores to 6.1.4 and to 7 with no change. Help! Thanks.