Federal Communications Commission.  Presidential appointed board that regulates interstate & foreign electrical communications systems originating in the United States, including radio, television, facsimile, telegraph, telephone, and cable systems.
Frequency Duplex Distance 
Frequency Division Multiplexing (Method)
Used in analog systems.  Multiple communications can occur without interference because each channel is assigned a specific frequency
Flexible Call Forwarding gives a mobile subscriber the flexibility to be contacted at different numbers at different times, depending on the subscription.
An MS is forced to register if it changes either location area or MSC/VLR service area.
Freephone service allows a mobile subscriber to have other mobile subscribers call them free of charge.
Used in analog systems.  Multiple communications can occur without interference because each channel is assigned a specific frequency
A communications technique where a bi-direction channel simultaneously transmits and receives between the MS and RBS via the two frequencies.