Originally Posted by PlanoFuji

Thieves aren't known for being particularly smart. If they find the phone (which I think they will fairly quickly) they will most likely keep it or try to sell it, particularly if you put a label or write on it "Emergency Phone"...

Smart thieves, will be looking for SpyBike like devices as soon as they are used to actually catch someone...

If it were me, given the odds of a touring bike being stolen (very low) and the likelihood that such thieves would keep such a phone (high considering stolen phones are routinely resold) I would choose the cheaper option, a disposable phone. However, if you do go with the SpyBike, check to make sure the cell service it needs is either included in purchase price or is a reasonable monthly (or yearly) cost... AND that the cell service type (GSM, CDMA, etc..) are compatible with the geographic areas you normally ride...

BTW, I got this idea from a news report of a women getting her purse back after the police used the cell tracing information she provided...