There are in fact some ways..<p>1) Measure power draw from the car battery (not 100% conclusive probably but a 24-hour measurement might be)<p>2) Get a 20$ RTLSDR stick, drive somewhere remote with no cell coverage and watch for the tracking device in the GSM&#x2F;3G frequencies - if found to try to connect it is at least powered on and trying to listen to commands<p>3) If activated and running on GSM, there might be a chance to listen to and decrypt its communication with the cell tower, especially if text messages are being used - and if not or it&#x27;s running on 3G you could still monitor how active and frequent the device is in sending and receiving data