Cellular telephones pick up and transmit signals through their own antennas, which may be attached to the handset itself or are mounted on a car, sometimes within inches of a passenger's head.

The telephone transmitted tiny impulses that could be isolated and converted into recognizable speech.

Many home-portable or cordless telephones, especially those that were designed in the 1980s, transmit low power FM audio signals between the table-top base unit and the handset on frequencies in the range 1600 to 1800 kHz.

The towers would resemble those now used for cellular telephones, but they would be far more numerous and capable of receiving the faint signals that small cellular telephones transmit.

All cellular telephones transmit radio-frequency radiation at the lowest end of the microwave portion of the electromagnetic spectrum.

Most of the expense of wire-line telephone service is the wires, so telephones transmit both the incoming and outgoing voice channels on a single pair of wires.

If telephone central office equipment can transmit telephone numbers to customers, it can also store them for several hours.

Cellular telephones transmit phone calls with radio signals instead of by electric current over copper wires.

Yakonov, however, knew that inanimate objects have no respect for human deadlines and that even by the 10th of January the telephone would not transmit human speech intelligibly.

The Bush Administration initially proposed to reward them by giving them, at no charge, the microwave frequencies on which the new telephones transmit signals.