1G

1G is short for 1^stGeneration of systems for mobile communications. The 1^st generation was analogue, datacommunication was not possible and the ability to use a mobile abroad was limited. There were a number of different systems in use which used a variety of frequency bands, channel widths and channel spacing.

In Europe, the 1^st generation mobile telephony systems operated in the 450 MHz and 900 MHz frequency bands. The primary analogue standards were TACS (Total Access Control System) and NMT (Nordic Mobile Telephone). France, Germany, and Italy also used different national standards:

• Nordic Mobile Telephone 450 MHz (NMT-450): used in Austria, Belgium, Czech Republic, Denmark, Finland, France, Iceland, Luxembourg, the Netherlands, Norway, Poland, Slovakia, Spain, Sweden and Turkey.
• Nordic Mobile Telephone 900 MHz (NMT-900): used in Denmark, Finland, the Netherlands, Norway, Sweden and Switzerland.
• (Extended) Total Access Communication System 900 MHz (ETACS): used in Austria, Ireland, Italy, Spain, and the UK.
• Netz-C 450 MHz: used in Germany, Portugal, and South Africa.
• Radiocomm 2000: used in France, on both 450 and 900 MHz .

In the USA and Canada AMPS was the most widely available cellular system.

Japan made use of the NTT System 900 MHz and a Japanese version of TACS 900 MHz.