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Global Tel Link (GTL), formerly known as Global Telcoin, Inc. and Global Tel*Link Corporation, is a Reston, Virginia–based telecommunications company, founded in 1989, that provides Inmate Calling Service (ICS) through "integrated information technology solutions" for correctional facilities [1] [2] which includes inmates payment and deposit, facility management, and "visitation solutions". [2]
IDT Corporation[2][3] (originally standing for International Discount Telecommunications) is a multinational provider of cloud communications, point of sale systems, unified communications, and financial services foreign exchange services for selected clients. It has units dedicated for businesses and consumers such as the Boss Revolution pre ...
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 links, cellular networks ...
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 ...
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OneSimCard's proprietary global travel SIM card [4] allows customers to call from anywhere in the world [5] without incurring additional roaming charges. [6] OneSimCard offers free incoming calls in over 160 countries, outgoing calls from 25 cents per minute and data service from 10 cents/MB.
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