You can dial any phone number directly from your address book. Our service provider partners are VoiceStream, Powertel, Pacific Bell Wireless, and BellSouth Mobility. If your current service provider supports GSM you can purchase a VisorPhone without a service plan and activate your VisorPhone by taking the SIM card out of your current phone and putting it inside VisorPhone. However, purchasing VisorPhone without a service plan is more expensive than purchasing it with a plan. You'll find GSM coverage in over 4000 cities and towns across North America.
Optional services are also available such as data services and PCS email.
In essence, it is the subscriber's authorization to use the network. It also holds the phone number, personal security key and other data necessary for the VisorPhone to function. The card can be switched from phone to phone, making the new phone receive all calls to the subscriber's phone number. The SIM card is one of the security devices on the GSM network, making it difficult to steal numbers or otherwise make fraudulent phone calls. The card also allows for roaming with other GSM operators around the world when you transfer your SIM card to a phone which uses the right frequency band for the countries you are traveling to.