The rate was $0.2 /min a couple of month ago, but I was charged $3 /min last time when making a call to China. When google t-mobile international rate, I saw two documents one say $0.2/ min, the other says $3 min. Was the rate changed recently without letting customs know? See the two links below
Calling Abroad | Stateside International Services | T-Mobile
www.t-mobile.com/optional-services/roaming.html