Dan Frommer with the bad news:
The biggest roadblock, for me, is data speed. T-Mobile’s free international roaming is only for 2G data service, which you probably haven’t used day-to-day since the first iPhone. After getting used to LTE speeds at home, it will seem unusably — or at least uncomfortably — slow.
YIKES. When I roamed in Canada a year ago I was bumped down to 3G speeds and I thought the world had ended. I’d expect my wireless carrier to pay me for using 2G, not the other way around.