Accessory for a device for use of a radio-based service

The invention relates to an accessory for a device for use of a radio-protected telecommunication and / or information service, its use is linked to identification means. It is based on the object of providing a device that appropriate facilities also allows the use of the service if it requires authentication using an identification means, but that unit itself does not have a corresponding identification means. The proposed solution to the attachment is designed as a mobile unit with a transmitting and receiving unit for wireless data exchange with the respective, used for use of a service facility. It has according to the invention on a receptacle for an identification module to use the service and its own power supply. The identification module can be activated to use the service of the units of a powered with the attachment means. The accessory is doing with regard to the actual use of the service is a passive unit that does not have particular its own Mobilfunksende- and receiving unit.