Nordic Mobile Telephone (NMT) is an analogue system for mobile communications. The system is developed jointly by the Nordic countries: Denmark, Finland, Iceland, Norway and Sweden. The first version, NMT-450 was introduced in 1981. The system has been used in a number of countries, mostly in Europe. NMT-450 made use of the 450 MHz band (450-470 MHz). The exact frequencies and the number of available channels varied among the contries. The original standard had a radio channel with a 25 kHz bandwidth. Although in a number of countries a version with 20 kHz radio channels has been used.
The second version, NMT-900, was introduced in 1986. This version made use of frequencies in the 900 MHz band that is now used by GSM.