A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls instead of incurring charges to the originating telephone subscriber. For the calling party, a call to a toll-free number from a landline is free of charge.
A toll-free, Freecall, Freephone, 800, 0800 or 1-800 number is identified by a dialing prefix similar to a geographic area code, such as 800. The specific service access numbers vary by country.
Prior to the development of automated toll-free service many telephone companies provided a manual version of caller free service.
Examples of operator-assisted toll-free calling include the Zenith number introduced in the 1950s in the US and Canada, as well as the original manual 'Freephone' service introduced by the British Post Office in 1960.
Both systems were similar in concept. The calling party would ring the operator (now '100' in the UK, '0' in Canada/USA) and ask for a specific free number. In the US, the caller would ask for a number like "Zenith 1-2345" (some areas used "Enterprise" or "WX" instead of "Zenith", but in the same pattern of a free service name and a five-digit number). In the UK, the caller would ask the operator to ring "Freephone" and a name or number (such as "FreephoneCrimebusters" to pass on tips about a crime to the constabulary
In either case, the operator would look up the corresponding geographic number from a list and place the call with charges reversed.
A Zenith number typically was available from a predefined area, anything from a few nearby cities to a province or state, and was listed in local directories in each community from which the subscriber was willing to accept the charges for inbound calls.
Until the introduction of InWATS toll-free service by the Bell System on May 2, 1967 and the Linkline (later "Freefone") 0800 services by British Telecom on 12 November 1985, manually ringing the operator was the standard means to place a toll-free call. More than a few established manual "Freephone" or "Zenith" numbers remained in use for many years after competing automated systems (0800 in UK, 1-800 in US) were deployed in parallel for new toll-free numbers.
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