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Have you entered #RON# on the keypad?
Is data roaming enabled in the phone's settings?
Have you called +1-505-998-3793 to discuss the issue with T-Mobile's international roaming specialists? (It's a free call from your T-Mobile phone.)
Hey there! Sorry to read you're having trouble reaching us! Were either of drnewcomb2's suggestions above -- to reach out to our international roaming team, or to check to make sure that roaming is enabled -- the ticket to fix this?