Mobile Radio Telephone

These early mobile telephone systems can be distinguished from the earlier closed radiotelephone systems in that they were available as a commercial service that was part of the public switched to telephone network, with their own telephone numbers, rather than the part of a closed network such as a police radio or taxi dispatch system.

These mobile telephones were usually mounted in the cars or trucks, though briefcase models were also made. Typically, the transceiver (transmitter-receiver) was mounted in the vehicle trunk and are attached to the "head" (dial, display, and handset) mounted near the driver seat.

They were sold through WCCs (Wireline Common Carriers, AKA telephone companies), RCCs (Radio Common Carriers), and two-way radio dealers.

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