There is no monthly fee to pay and your privacy is completely protected. With i.Trek TR-1, user can track any object globally in real time as long as the tracking object is within cell phone network and has line of sight with sky. Application Examples Vehicle Tracking – Locate important vehicles and assist in stolen vehicle recovery. Personal Tracking – Locate lost children or senior citizens. Requirements for using i.Trek TR-1: 1. A SIM card with a valid phone number associated for the tracker.