Re: In the us only tmobile or att works with the sim based iphon
For some time you could easily purchase an iPhone on eBay (or on certain cell phone sales sites) that is unlocked and will work with T-Mobile....Probably a 3G one too. -- UCLA Only On A Clear Day-Class of '81
Nope. T-Mobile uses the 1700/2100 AWS band for 3G. There is no iPhone with this band configuration. While you can get an unlocked iPhone that will run on any GSM carrier, you will not get 3G service on T-Mobile with it.