It can also be configured to support single-band and data applications. The module is designed to be on all the time, even when not in the Visor, for receiving and storing messages.
Users pay a monthly service charge.
Glenayre Electronics, Inc. This module snaps onto the Handspring Visor to turn it into a wireless phone with a GSM connection. Features include caller ID, call waiting, three-way calling, speed dial, call history, voicemail, SMS text messaging, and vibrating alerts. To use the modem, you'll need an account with a Wireless IP service provider. Read a full review .