Yes! Cell phones from nearly every manufacturer will work on our network as long as they are unlocked and GSM-compatible.
If you begin your Ultra Flex Family or Ultra Flex registration and your phone doesn't allow you to make calls, won't grant access to your phone book, or says "Restricted" or "Contact Service Provider," the phone is most likely locked. Contact your old carrier to unlock your phone.
Unfortunately, BlackBerry phones and older Sidekick phones will not work or may have limited functionality with Ultra Flex Family or Ultra Flex service. We cannot guarantee all of a phone's functions – such as picture messaging, web usage and other phone-specific applications – will be compatible with Ultra Flex Family or Ultra Flex service.