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In page Non-geographic telephone numbers in the United Kingdom:

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On 1 July 2015, a simplified universal charging system was introduced for 087 numbers and all other 'service numbers'. Calls to all 087 numbers now consist of a 'service charge' of up to 13p per minute and/or 13p per call, plus a standard 'access charge' set by the caller's own phone company which typically ranges from 7p to 45p per minute.[17][18] The total call cost therefore typically ranges from 7p to 58p per minute.