An electronic monitoring system and method for monitoring one or more transport services, wherein for each one of one or more portable electronic devices, data of the portable electronic device indicative of the location of the portable electronic device is monitored and the location data stored in a memory of the portable electronic device. Each device monitors for a boarding trigger event indicative of a user carrying the portable electronic device boarding a transport service, and upon a boarding trigger event occurring, communicates monitoring data to a remote monitoring system, the monitoring data including at least time data of the boarding trigger event and data indicative of the location of the portable electronic device. The remote monitoring system monitors one or more transport services using data communicated by the portable electronic devices.