1G

first generationfirst-generationAnalog Networksmobile telephony service
1G refers to the first generation of wireless cellular technology (mobile telecommunications).wikipedia
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Cellular network

cellularmobile networkcellular networks
1G refers to the first generation of wireless cellular technology (mobile telecommunications).
The first commercial cellular network, the 1G generation, was launched in Japan by Nippon Telegraph and Telephone (NTT) in 1979, initially in the metropolitan area of Tokyo.

2G

2.5G2.75G2.5
These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications.
After 2G was launched, the previous mobile wireless network systems were retroactively dubbed 1G.

Nordic Mobile Telephone

NMTNMT-450NMT 450
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.
NMT is based on analogue technology (first generation or 1G) and two variants exist: NMT-450 and NMT-900. The numbers indicate the frequency bands used.

Wireless

wireless communicationwireless communicationswireless internet
1G refers to the first generation of wireless cellular technology (mobile telecommunications).
Cellular networks: 0G, 1G, 2G, 3G, Beyond 3G (4G), Future wireless

C-Netz

1G cell phones (C-Netz)C-450C-Net C450
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.
The Radio Telephone Network C (German: Funktelefonnetz-C, abbreviated as C-Netz), was a first generation analog cellular phone system deployed and operated in Germany (at first West Germany) by DeTeMobil (formerly of Deutsche Bundespost Telekom, currently Deutsche Telekom).

3G

3G networkIMTthird generation
3G
A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.

Total Access Communication System

ETACSTACSTotal Access Communication
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.
Nordic Mobile Telephone (NMT) is another 1G analog cellular standard that was widely used in Europe, mainly in the Nordic countries, which has now been fully replaced by GSM except for limited use in rural areas due to its superior range.

List of mobile phone generations

cellular mobile communications7Ggeneration
List of mobile phone generations
A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1981/1982.

Mobile radio telephone

0Gmanual mobile telephone systemmobile radio telephony
The antecedent to 1G technology is the mobile radio telephone.
1G

Technology

technologiestechnologicaltechnical
1G refers to the first generation of wireless cellular technology (mobile telecommunications).

Mobile computing

mobilemobile computermobile computers
1G refers to the first generation of wireless cellular technology (mobile telecommunications).

Telecommunication

telecommunicationscommunicationstelecom
1G refers to the first generation of wireless cellular technology (mobile telecommunications).

Analog signal

analoganalogueanalogue signal
These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications.

Data transmission

digital communicationsdata transferdata communication
These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications.

Modulation

modulatedmodulatordigital modulation
Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the voice itself during a call is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency, typically 150 MHz and up. The inherent advantages of digital technology over that of analog meant that 2G networks eventually replaced them almost everywhere.

Nordic countries

NordicNordic regionNordics
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.

Switzerland

Swiss🇨🇭SWI
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.

Netherlands

Dutch🇳🇱the Netherlands
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.

Eastern Europe

EasternEastern EuropeanEast European
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.

Russia

🇷🇺RUSRussian
One such standard is Nordic Mobile Telephone (NMT), used in Nordic countries, Switzerland, the Netherlands, Eastern Europe and Russia.

Advanced Mobile Phone System

AMPSanalogAdvanced Mobile Phone System (AMPS)
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.

North America

NorthNAAmerica
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.

Australia

🇦🇺AUSAustralian
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.

United Kingdom

British🇬🇧UK
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.

West Germany

West GermanFederal Republic of GermanyGermany
Others include Advanced Mobile Phone System (AMPS) used in North America and Australia, TACS (Total Access Communications System) in the United Kingdom, C-450 in West Germany, Portugal and South Africa, Radiocom 2000 in France, TMA in Spain, and RTMI in Italy.