An office electronic apparatus is associated to an apparatus card and is able to use or provide a service by means of identification information; the identification information allows billing of the use or provision of the service. A mobile telephone terminal is associated to a subscriber card storing subscriber identification information. According to the method of the present invention, at least the subscriber identification information and preferably also subscriber authentication information are transferred from the mobile telephone terminal to an office electronic apparatus when the said mobile telephone terminal is in proximity of the office electronic apparatus, the transferred information is stored into the apparatus card of the office electronic apparatus, and the service is autonomously used or provided by the office electronic apparatus by means of the transferred information.