No - the GPZ doesn't have mobile phone/cellular or wifi network capabilities.
GPS trackers calculate the current GPS location from receiving the GPS satellite signals.
The tracking device then transmits the current location at set intervals, to mobile phone/cellular network towers or via a wifi network, basically to the specified internet database/system site.
There are GPS trackers that will store location/movement data internally but these are useless in the case of stolen property.
GPS alone isn't 2 way. It's a receiver only.