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The Telephones Portal. A rotary dial telephone, c. 1940s. A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables ...
Overview. Mobile number portability is implemented in varying ways across the globe. The international and European standard implements "recipient-led" porting, in which a customer wishing to port a telephone number contacts the new network (recipient), which sends the number portability request (NPR) to the current network operator (donor).
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 ...
Lifeline refers to the Universal Service Fund's Lifeline low-income phone program. In the case of providers with both Lifeline and non-Lifeline offerings, but different options for each (as opposed to the same options, but different costs), the Lifeline offerings have been put on a separate row with "[Lifeline]" in the "Company" field.
The acoustic tin can telephone, or "lovers' phone", has been known for centuries. It connects two diaphragms with a taut string or wire, which transmits sound by mechanical vibrations from one to the other along the wire (and not by a modulated electric current). The classic example is the children's toy made by connecting the bottoms of two ...
TracFone Wireless, Inc. ( TFWI) is an American prepaid, no-contract mobile phone provider. TFWI is a subsidiary of Verizon Communications, [1] and offers products and services under several brands. It operates as a mobile virtual network operator (MVNO), holding agreements with the three largest United States wireless network operators to ...
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