This article is for the Telephone Company. For the Tata Group company, see TATA Engineering and Locomotive Company

A telephone company (or telco) provides telecommunications services such as telephony and data communications. Most of the largest telcos are or were at one time nationalized or state-regulated monopolies. These monopolies are often referred to, primarily in Europe, as PTTs.

Telcos are also known as carriers. And with the advent of cellular telephony, telcos now include wireless carriers.

Most telcos now also function as ISPs, and the distinction between telco and ISP may disappear completely over time.

The comedian Lily Tomlin satirized the attitudes of many telcos with the quote:

"We don't care.

We don't have to.

We're the phone company."

Telcos include:

• AT&T (merged with SBC listed below)
• BC TEL
• Belgacom
• Bell
• Bell Canada
• BellSouth
• British Telecom
• Cable and Wireless
• France Télécom
• Deutsche Telekom
• GTE
• Iceland Telecom
• ITT
• KPN
• Level 3
• MCI (MCI/Worldcom)
• MATÁV
• Nortel
• NTT
• Orange
• Qwest
• SBC Communications
• SFR
• Sprint
• Telecom Italia
• Tele2
• Telefónica
• Teleglobe
• Telemar
• Telfort
• Telia
• Telstra
• TELUS
• Thus
• Videsh Sanchar Nigam Ltd
• Vodafone
• WorldCom
• Verizon

See also:

• ISP
• PSTN