[mrtimo]

T-mobile (Post-paid) has free international data and SMS... works in 100s of countries. No extra cost. This is the sole reason I am a customer.

The data is slow, but definitely good enough. It is good enough to use google hangouts to call phones back in the states.

[kobeya]

T-mobile also routes though a Texas VPN when you're out of the country, which has its tradeoffs (super annoying latency, but no censorship in places like China).

[ctphipps]

This is the way that mobile data roaming works - the Internet egress point is your home carrier's, not the carrier on which you are roaming. Nothing special about T-Mobile here.