Most probably not aware how cheep these are now.
http://www.ebay.com.au/sch/i.html?_nkw=car+gps+tracker Possible reason as with mine on my Van is its 2G, which is shut December 2016 Mine is set up, just ring it, and it transmits longitude and latitude back to my phone.
However, as 2G is coming to an end, an astute person will select the right one I am sure
Wont get this guys car back, but may save somebody a painful experience