Abstract: A personal mobile emergency call device (1), comprises a subscriber identification module (15) having stored therein a mobile subscriber identity for registering and identifying a user of the personal emergency call device (1) in a mobile radio network (3), and an alarm module (11) configured to execute on behalf of the user an emergency call via the mobile radio network (3) to a computerized central service unit (2). The alarm module (11) is further configured to transmit in association with the emergency call automatically to the central service unit (2) via the mobile radio network (3) a personal emergency call device identifier (112) stored in the personal emergency call device (1) for identifying non-ambiguously the personal emergency call device (1) and its user at the central service unit (2). The alarm module transmits the emergency using informations redundancy, i.e. forward error correction and communication redundancy, i.e transmission via multiple communication channels in parallel.

Abstract: For monitoring a battery status of a battery included in a mobile communication device (1), battery status reports are received (S12) in a computerized service unit (2) via a mobile radio network from the mobile communication device (1). The battery status reports include at least an electrical battery parameter indicative of a current charge or voltage level of the battery. Based on the battery status reports, received from the mobile communication device (1), battery data is stored (S17) in the computerized service unit (2), the battery data including at least a time series of the electrical battery parameter. Using the battery data, determined is a deviation of a battery parameter, included in the battery status report, from an expected value of the battery parameter derived from the battery data.