Hi. I'm deciding on what carrier to choose and what phone to use. My question is, is there a difference in T-Mobile frequencys between the GSM iPhone 4 and the iPhone 4S? (4S is GSM and CDMA, correct?) I know people don't receive 3G with T-Mobile on an iPhone 4, but I've heard some people say that the iPhone 4S can receive T-Mobile 3G. Is this because of a hardware change, or a tower change? The 4S is supposed to be a world phone, right? Shouldn't it support almost all conventional frequencies? I'd really like T-Mobile, because their $30 dollar prepaid plan looks great. However, I would use data a ton, and I'd like to have 3G. Also, does T-Mobile have HPSA+, like AT&T? After all, they're partnered. I'd think they'd at least share towers if they don't merge. Thanks for any help.