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If that's true, it sounds like an extra cell phone which is left in a trailer or vehicle strickly as an anit-theft device might be worth it. Hide it in the vehicle then call it after a theft and have it traced.
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This summer here in Athens a guy shot and killed his wife and to male acquaintances, and then he fled. The found his his car a few days later when the cell phone died and sent out a "ping". It was in a wooded area in a ravine.
I don't know how accurate this information is but it explains cell phone tracking.
Apparently a cell phone that is on can be tracked. If it is off it can be located from it dying ping when the battery dies.
http://www.ehow.com/how_2385973_tria...ell-phone.html