The contract entered into with the firm may be in writing or otherwise.
geographic numbers or numbers which are always set at the same rate, which usually begin with the prefix 01, 02 or 03;
calls which can be free of charge to call, for example 0800 and 0808 numbers; and
standard mobile numbers, which usually begin with the prefix 07, provided that the firm ordinarily uses a mobile number to receive telephone calls.
premium rate numbers that begin with the prefix 09;
other revenue sharing numbers in which a portion of the call charge can be used to either provide a service or make a small payment to the firm, such as telephone numbers that begin with the prefix 084 or 0871, 0872 or 0873; and
telephone numbers that begin with the prefix 0870 as the cost of making a telephone call on such numbers can be higher than a geographic cost and will vary depending on the consumer’s telephone tariff.