From Fedora Project Wiki
US SIM cards for Flock attendeed
Ready SIM is USA service for short-term wireless prepaid SIM cards.
Who's interested in
- will Ready SIM work with my smartphone
- Ready SIM uses T-Mobile network with a bit non-standard UMTS frequencies. Your phone has to support 3G in 1700/1900 band. No guarantees it will work with phones supporting 1900 only. 2G fallback should always work.