I have an iPhone 5S with a bad IMEI. How can I get it past the activation screen? It's an AT&T iPhone. I don't have an AT&T SIM though. With a T-Mobile SIM, it says your SIM isn't supported. Without a SIM, it says to insert one (both if I try to activate through WiFi or via iTunes). Pangu has error when trying to Jailbreak it, as it can't really communicate with the computer before activation... Any ideas?