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2. Plain old telephone service - Wikipedia

   en.wikipedia.org/wiki/Plain_old_telephone_service

   Plain old telephone service. Plain Old Telephone Service (POTS), or Plain Ordinary Telephone System, [1] is a retronym for voice-grade telephone service employing analog signal transmission over copper loops. Originally POTS stood for Post Office Telephone Service as early phone lines in most parts of the world were operated directly by the ...

3. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over Internet Protocol (VoIP), [a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the ...

4. PlainTalk - Wikipedia

   en.wikipedia.org/wiki/PlainTalk

   PlainTalk is the collective name for several speech synthesis (MacinTalk) and speech recognition technologies developed by Apple Inc. In 1990, Apple invested a lot of work and money in speech recognition technology, hiring many researchers in the field. The result was "PlainTalk", released with the AV models in the Macintosh Quadra series from ...

5. 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 ...

6. Public switched telephone network - Wikipedia

   en.wikipedia.org/wiki/Public_switched_telephone...

   Public switched telephone network. The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission ...

7. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   AT&T, T-Mobile, Verizon, Boost Mobile, and UScellular also sell SIM cards through their retail channels, both in-store and online. The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the ...