International Roaming with T-Mobile ToGo
From HowardForums Wiki
As of this writing (February 2007) the only international roaming available with T-Mobile To Go is in Canada and Mexico. The countries you may roam in may change at a later date, but for now roaming is only available in Canada and Mexico.
Roaming in Canada with T-Mobile To Go
T-Mobile To Go can Roam on the Fido/Rogers Wireless 850/1900MHz network in Canada.
Voice calls are billed at (USD)69¢/min for both incoming and outgoing voice calls to any Canadian or US number.
SMS rates remain the same as in the US at 10c outgoing and 5c incomming
T-Zones works for free. (they are still the limited T-Zones choices)
You are able to dial #999# to retrieve your balance/expiry date.