A storage unit for a portable radio-communication device includes a main data carrier and a contactless chip associated with the main data carrier. Device data descriptive of the storage unit is transmitted to the portable radio-communication. Further, a warning is transmitted to the portable radio-communication device in response to a storage unit wanted notice. A powering signal is transmitted to the contactless chip. The powering signal provides power to the contactless chip and is modulated with data. Specific data sent by the portable radio-communication device is stored on the contactless chip and, on request, data is returned.