The American Bell System introduced the first push-button telephone. Early telephones had rotary dials, which meant that numbers were dialed by rotating the dial. In 1941, Western Electric first experimented with a push-button telephone. This is a mechanical method.

But the device was unsuccessful. After nearly three years of testing, the Bell System introduced the transistor push-button telephone on November 18, 1963. Bell uses dual-tone multi-frequency technology (DTMF). Digital touch-tone phones entered the market in the early 1970s.

Using metal oxide semiconductor integrated circuits (ICs). The phone can also store phone numbers for speed dialing in a MOS memory chip.