Scrap metal and sellable parts as well. Most likely a SIM card you can get a bunch of free internet out of too.
replyIt'd be interesting to see what endpoints they submit the data to...
replywon't they able able to track you down if you start using the SIM though?
replyThey can track the locations where you use that card, and the locations where you use the phone the card was in, before and after the card was in it.
replyTake this information as you will.
ETA: "use" means "have a battery inserted"