These phone numbers are charged at a higher rate than normal, with part of the call cost used to pay for the service being provided.

Common uses for service numbers include: The cost of calling an 09 number includes a service charge of up to £3.60 per minute and/or £6.00 per call which is used to fund the service provided, on top of a standard access charge made by the caller's phone company.

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Charges can be levied per-second, or a fixed fee per-call, or a mix of the two.

Traditionally used for chat lines, competition lines, and adult entertainment services, many successful businesses have been built on premium rate numbers.

Premium Rate Number Services (also known as PRS/PRN) begin with 09 or 087.

These numbers cost in excess of 5p per minute to call and are regulated by the Phone-paid Services Authority (PSA)

In some jurisdictions, telephone companies are required by law to offer such blocking.

Adult chat lines (phone sex) and tech support are a very common use of premium-rate numbers.

Since 2005, all new services of this type use numbers beginning with '098', to aid recognition.

Charges to callers can go as high as £1.53 per minute, and substantial revenue share of up to £1.33 per minute is available to you as the operator of an 09 premium rate service.

The most expensive premium rate numbers cost up to £3 per minute and even the cheapest cost about 75p per minute.