I have an At&t account and i've had it since the first iphone so i'm granfathered in. They want to charge me 850 for a new one because they say i'm in eligible, even though last year i bought an unlocked phone for that price. so im' considering switching. i don't mind losing the unlimited data because i never use over a gig a month anyway, and i'm interested in a shared plan for multiple devices, which would cause me to lose that anyway, and att has terrible service in my area. but i do like and use voice and data at the same time. speed is important though my question is more related to what is easier to use over seas. I like gsm because all i can do is get a local sim and i'm good to go. i don't know how cdma works in that regard. would love to know which is best.