Your best bet is to purchase a factory unlock from a reputable seller on eBay.
And I would also advise to at least get an iPhone 4. Definitely not an iPhone 3G, since they're no longer supported with software updates, and iPhone 3GS, even though it'll get iOS 6, it's just too old and outdated hardware-wise at this point.
I am a little confused. My Verizon phone was able to roam on GSM because they used TDMA. Tell it was shutdown. The phone recognizes it as Analog. If PCS has TDMA, It could be technically be used on GSM.
Originally Posted by Tabla
Y'know, I'm used to hysterical 14-year-old ******** on the internet, but this is exceptional. Never before in human history have so many nerds hyperventilated so publicly over so little.
People can use iPhone on the T-Mobile network but in parochial to torrent. The 3G band of T-mobile has uncommon frequency which is different from the AT&T and it does not support it. With the help of data plan for our mytouch, it should run well. People need jailbreak the phone to unlock phone and 3G & 3GS both be jailbroken.