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"phone" redirects here. for other uses, see phone (disambiguation) . for the handheld personal computer, see smartphone . a rotary dial telephone, c. s at&t push button telephone made by western electric , model dmg black, a telephone (derived from the greek : τῆλε, tēle, "far" and φωνή, phōnē,
shown) that sends dtmf tones to the exchange. a rotary-dial telephone uses pulse dialing , sending electrical pulses, that the exchange counts to decode each digit of the telephone number. if the called party's line is available, the terminating exchange applies an intermittent alternating current (ac...
https://en.wikipedia.org/wiki/Telephone