Method of prepaying for consumption of telephone calls
Method of preventing fraudulent toll calls by key system users
Method of providing message service for pinless limited access t
Method of time-to-talk calculation
Methods and apparatus to manage collect phone calling limits
Modular public telephone for outside use
Monitoring system for remote devices
Motion detection for preventing removal of a fixed wireless term
Multi-function general purpose transceiver
Multi-function general purpose transceiver
Multi-function general purpose transceiver