Did you know that new cell phones use GSM technology?  Yes, they do.  That let’s the police track you through your cell phone.  This has been useful to several people in my metropolitan area over the past year or so when they were carjacked and stuffed in the trunk.  They contacted the police to report the situation and the police tracked them.  I understand the technology is so good they can trace you to within about 2-3 meters (6-10 feet).  Interesting no?