An organization that provides voice transmission services, such as AT&T and Verizon. A company that specializes in manufacturing telephones and related equipment may also be called a telecom company.

BT Group is the world's oldest communications company. We can trace our roots all the way back to The Electric Telegraph Company.

A telecommunications service provider (TSP) is a type of communications service provider that has traditionally provided telephone and similar services. This category includes incumbent local exchange carriers, competitive local exchange carriers, and mobile wireless communication companies.

In telecommunication, a telecommunications service is a service provided by a telecommunications provider, or a specified set of user-information transfer capabilities provided to a group of users by a telecommunications system.