Editing Nordic Mobile Telephone (section)

{{short description|Mobile telephone system}}
{{Use dmy dates|date=May 2022}}
{{More citations needed|date=March 2009}}
[[File:Nokia 150 and nokia 1100.jpg|thumb|150px|The Mobira Cityman 150, Nokia's NMT-900 mobile phone from 1989 (left), compared to the dual-band GSM [[Nokia 1100]] phone from 2003.<ref name="Nokia 1100">{{cite press release|title=Nokia 1100 phone offers reliable and affordable mobile communications for new growth markets|publisher=Nokia Corporation|date=27 August 2003|url=http://press.nokia.com/PR/200308/915317_5.html|access-date=26 May 2009|archive-url=https://web.archive.org/web/20081206070531/http://press.nokia.com/PR/200308/915317_5.html|archive-date=6 December 2008|url-status=dead}}</ref>]]
'''NMT''' (''Nordic Mobile Telephony'') is an automatic cellular phone system specified by [[Nordic countries|Nordic]] telecommunications administrations ([[Postal Telephone and Telegraph|PTT]]s) and opened for service on 1 October 1981. NMT is based on [[analog signal|analogue]] technology (first generation or [[1G]]) and two variants exist: NMT-450 and NMT-900. The numbers indicate the frequency bands used. NMT-900 was introduced in 1986 and carries more channels than the older NMT-450 network.

The NMT specifications were free and open, allowing many companies to produce NMT hardware and pushing prices down. The success of NMT was important to [[Nokia]] (then [[Mobira]]) and [[Ericsson]]. The first Danish implementers were [[Storno]] (then owned by [[General Electric]], later taken over by [[Motorola]]) and AP (later taken over by [[Philips]]). Initial NMT phones were designed to mount in the trunk of a car, with a keyboard/display unit at the driver's seat. "Portable" versions existed, though they were still bulky, and with battery life a big problem. Later models, such as [[Benefon]]'s, were as small as {{convert|100|mm|abbr=in}} and weighed only about 100&nbsp;grams.