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Trunk Vs TollIn the US, under the purview of the Bell system, local telephone calls were free and the term toll was adopted for long distance calls because they were subject to a toll. In the UK all calls were chargeable and the term trunk was adopted for long distance calls. Initially all trunk calls had to be pre-booked and the operator called you back when the call could be put through. In 1921 the first toll exchange was opened which allowed the shorter distance trunk calls to be connected while you waited. The name toll was probably taken from US usage. The distinction between trunk and toll became irrelevant when subscriber trunk dialling (STD) was introduced.
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