In this disclosure, a person may be identified by: (i) receiving a first message comprising an ID of a first device and a hardware ID of a personal emergency device; (ii) linking the personal emergency device with personal data of the person, the personal data being associated with the ID of the first device; and (ii) receiving a second message from a mobile device comprising the hardware ID of the personal emergency device. In response to receiving the second message, and/or receiving a subsequent message received via the mobile device and comprising the hardware ID of the personal emergency device, a message is transmitted to a monitoring station based on the prior association of the personal data with the hardware ID of the personal emergency device. The message includes the personal data or an identifier for identifying said personal data.