I actually work for AT&T so I can shed some light on the data thing.
By swapping the sims, you'll escape the data for a little while but we'll eventually add it for you. Every call or text sends your phones identity to us and we do audits based on that info. Where the phone came from or your contract status with us has no bearing on it, it will get added sooner or later. Once it's on it's not coming off until you bring us a non smartphone to use, put it back in the iPhone and it'll back on even faster. Sorry man, but your mom is gonna have a data plan soon.
As far as phones go, I couldn't use anything but my iPhone. Ever. Every other phone seems to have some blaring oversight or major issue that would make it unusable as far as I'm concerned. Id have to make my expense cuts elsewhere...
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