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2. Mobile radio telephone - Wikipedia

   en.wikipedia.org/wiki/Mobile_radio_telephone

   A mobile radio telephone. Mobile radio telephone systems were mobile telephony systems that preceded modern cellular network technology. Since they were the predecessors of the first generation of cellular telephones, these systems are sometimes retroactively referred to as pre-cellular (or sometimes zero generation, that is, 0G) systems.

3. Improved Mobile Telephone Service - Wikipedia

   en.wikipedia.org/wiki/Improved_Mobile_Telephone...

   IMTS mobile phone in a briefcase. The Improved Mobile Telephone Service (IMTS) was a pre-cellular VHF/UHF radio system which linked to the public telephone network.IMTS was the radiotelephone equivalent of land dial phone service.

4. Mobile Telephone Service - Wikipedia

   en.wikipedia.org/wiki/Mobile_Telephone_Service

   The Mobile Telephone Service (MTS) was a pre-cellular VHF radio system that linked to the Public Switched Telephone Network (PSTN). MTS was the radiotelephone equivalent of land dial phone service. The Mobile Telephone Service was one of the earliest mobile telephone standards.

5. 1G - Wikipedia

   en.wikipedia.org/wiki/1G

   NMT was the first mobile phone network to feature international roaming. In 1983, the first 1G cellular network launched in the United States, which was Chicago-based Ameritech using the Motorola DynaTAC mobile phone. In the early to mid 1990s, 1G was superseded by newer 2G (second generation) cellular technologies such as GSM and cdmaOne.

6. List of wireless network technologies - Wikipedia

   en.wikipedia.org/wiki/List_of_wireless_network...

   2G (or 2-G) provides three primary benefits over their predecessors: phone conversations are digitally encrypted; 2G systems are significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS (Short Message Service) plain text-based messages. 2G technologies enable the various mobile phone ...

7. Altai (mobile telephone system) - Wikipedia

   en.wikipedia.org/.../Altai_(mobile_telephone_system)

   It is a fully automated UHF/VHF network that allows a mobile node to connect to a landline phones, and was originally conceived to serve government officials and emergency services, but has since spread into general use, and is still in use in some places, where its advantages outweigh those of conventional cellular networks. Work on the system ...