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AT&T, T-Mobile, Verizon, Dish Wireless , 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 ...
RingCentral Office is a cloud-based PBX system for businesses. RingCentral Office features include call auto-attendant, company directory, call forwarding and handling, multiple extensions, a mobile app for iPhone and Android, Business SMS, video conferencing and screen-sharing, and fax. RingCentral Glip
The list is limited to dot-com companies, defined as a company that does the majority of its business on the Internet, with annual revenues exceeding US$1 billion. It excludes Internet service providers or other information technology companies. For a more general list of technology companies, see list of largest technology companies by revenue.
AT&T and its subsidiaries held a phone service monopoly, authorized in 1913 by government authorities with the Kingsbury Commitment, throughout most of the twentieth century. This monopoly was known as the Bell System , [28] and during this period, AT&T was also known by the nickname Ma Bell .
In telecommunications, 5G is the fifth-generation technology standard for cellular networks, which cellular phone companies began deploying worldwide in 2019, and is the successor to 4G technology that provides connectivity to most current mobile phones. Like its predecessors, 5G networks are cellular networks, in which the service area is ...
It also purchased AT&T's landline business in Connecticut in 2013, though these are not considered an RBOC, as the Southern New England Telephone Company, from which they descend, was a franchisee of the Bell System, and not subject to the same regulations after the Bell System breakup.
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