A system enables tracking of a communication device associated with a subscriber of a geo-location tracking service. The system receives (1115) a set of subscriber-defined alarm conditions associated with the tracked communication device. The system further receives location (1435) and sensor data (1440) associated with the communication device. The system compares (1510) the location and sensor data with each alarm condition of the set of subscriber-defined alarm conditions. The system indicates an occurrence of one or more alarm events based on the comparison (1520).
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