Generally for my travel in the states, I use a separate phone (an oldish Samsung) with a T-Mob prepaid sim. It turns out that my BB is unlocked and while I can use the wifi sometimes, it would be much simpler to just pop a US sim in there and redo the settings in order to have US access all the time, but I'm not finding any useful information on data rates. I know I could go into a store, but thought I'd ask here. Is anyone doing this and is there an unlimited data cost on prepaid Tmo?