The invention provides a method of billing for use of a telephone (12) which has an electronic identification module, typically a SIM card (14). The method includes storing on the identification module account information (14.2) relating to a telephone account for use of the telephone (12), and automatically adjusting the account information (14.2) in response to billable use of the telephone (12). The SIM card (14) permits the setting of a maximum call cost, so that the telephone (12) can be used as a payphone. The invention extends to a SIM card (14) which is configured for managing billing for use of a telephone (12) to which the SIM card (14) is, in use, connected.
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