[adam917]

From what I understand, when 3G was 1st rolled out in the US, it was at 1900 MHz only, with 850 added later on (especially after the analogue shutdowns of 200. Many cities that has only 1900 got 850 MHz overlays in 2009, which greatly improved coverage. My suggestion to you is to just try it if you don't want to buy a new phone. Given that wherever AT&T is licensed to use 850, they will want to use it, it would make sense that they would try to use 850 as much as possible for 3G. I bet you wouldn't be missing much by having only 850 especially if you're in a large 3G market like any of the major metro areas.