Omnipoint allows users to access information, such as weather, by sending a message from the phone. Omnipoint also has a voice dialing feature. GSM networks, such as Omnipoint, allow for global roaming, using a special chit found in every GSM phone, containing personal information and phonebook. Nextel has a Direct Connect, two-way radio feature, popular among contractors. Direct Connect minutes are separate from voice minutes, and under certain plans can be unlimited.
Sprint allows unlimited calls to others within the network, for a small monthly fee.
Price alert - not all of these services are free though. The other charge after a certain number. This leads me to coverage. Coverage All of the carriers have similarly priced national, regional, or local plans. The regions and local areas differ greatly, though.