Some devices have issues with automatic network registration and profile change in the USA.
If you get no connection in the USA, please do next:
- Android: Go to Applications > SIM Services or SIM Toolkit (will be a new app between your other apps with an icon like a SIM Chip named SIM APPLICATIONS, PROFILES, TOOLS or TOOLKIT)
- iOS: Go to Settings > Phone > SIM Applications
- Windows: Settings > mobile + SIM > SIM settings > SIM applications
- Non-smartphones: Go to the main menu of the device > select SIM Services or SIM Toolkit
Wait few minutes and try connection.
In the USA we got coverage in T-Mobile and AT&T networks, please try both to find better speed (depending on your location).