Hello slngkim!
Speeds may vary depending on our roaming partner's network. Our Simple Global plan provides up to 128kbps speed (2G Speeds), ideal for e-mail, web pages, navigation, and social apps. Some applications like streaming music or video will be more difficult than when on T-Mobile’s domestic network. However, higher-speed data passes will be available for purchase when you are abroad:
- Single day pass: $15 for 100MB (high speed data capped at 100MB)
- 7 day pass: $25 for 200MB (high speed data capped at 200MB)
- 14 day pass: $50 for 500MB (high speed data capped at 500MB)
You can find this information here: http://www.t-mobile.com/optional-services/roaming.html. Please let us know if you have additional questions.