Appalachian Wireless is a carrier, and is the only company that sells its phones. Only devices purchased from Appalachian Wireless or previously activated on the service are officially supported on its network.
Appalachian Wireless operates is own network rather than reselling spectrum on a national carrier's network. This means that unlike many smaller carriers, there is no larger carrier selling devices guaranteed to be compatible with its network. The network uses CDMA wireless technology, which means that phones from AT&T, T-Mobile and most international carriers cannot be used. This is due to incompatible network technology, and is true of both locked and unlocked phones.