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Plain Old Telephone Service

Plain Old Telephone Service, or POTS, are the services available from an analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. These services had been available almost since the introduction of the telephone system in the late nineteenth century.

These services included:

With the advent of electronic telephone exchanges and computerisation during the 1970s and 1980s, a raft of new network services became available. These had been termed PANS for Pretty Advanced Network (or New) Services by some in the industry, although that term has never really caught on. The service offered include: and a number of other similar services.

The new services were made possible by the introduction of the support network for the ISDN as well as raised consumer expectations from services offered on mobile telephones.

Historical Note

The system now known as the Plain Old Telephone Service was originally knowns as the Post Office Telephone Service or Post Office Telephone System. The term was dropped as telephone services were removed from the control of national post offices.