Tracking companies are making business just because of lack of awareness among people. Trackers are very good devices and should be used if ever you want to keep a check on old person, your personal car being used by driver and on teenager boy. Don’t expect that it will help you in theft as weak gsm signal, gps signal, wifi signals are easily jammed via transmitting noise on those bandwidth. How do you expect tracking companies to help you once these devices have a serious technical limitations.