SIM Cards for Spetrotec Big-Watcher Portable Vehicle Tracker + Save History Affordable prepaid SIM card for Spetrotec Big-Watcher Portable Vehicle Tracker. Stay connected with your device using this SIM card, compatible with 4G, 3G, and 2G devices. Works seamlessly with over 1500 GPS Tracker models, ensuring wide compatibility across devices. The package includes the TurnKey Mobile App for GPS Tracking, providing you with a complete solution for monitoring your vehicle's location. Compatible with 4G, 3G, and 2G devices Works with over 1500 GPS Tracker models Includes TurnKey Mobile App for GPS Tracking