when did push button phones come out in the uk
Push-button telephone In the UK, a brief excursion from standards, GPO telecoms introduced in 1968 their first push-button telephone, the GPO 726 (Ericsson N2000 series [22]), that used neither pulse dialing nor DTMF tones. It used a DC signalling system comprising a number of rectifier diodes[23] arranged in different polarity configuration according to the button pressed. The 726 also requires a ground wire as well as the usual A and B wires. The irony was that with the few installations, the dial signal still had to be converted to pulses in the host PABX. It is now a rare device.
History of mobile phones In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946, AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Calls were set up manually by an operator and the user had to depress a button on the handset to talk and release the button to listen. The call subscriber equipment weighed about 80 lb.[11]