Thats one big reason I went with TMobile way back when, then eventually Cingular. It's much harder for the carrier to pull this kind of crap when it's a GSM network and device. Right now, I have my AT&T iPhone 3GS SIM and account in an iPhone 2G running Android. I didn't have to call the carrier to change anything, or reprovision a device. It just works, and it's just like most of the rest of the world. Verizon and Sprint are two providers I will never use unless they move to a more widely adopted network standard.