can you?

not true. Every phone pings various towers at intervals, thats how it know what the signal strength is. AND most newer phones have GPS on almost all of the time, AND many newer phones have a kind of lojack that kicks in whenever 911 is dialed. So, yes, it is possible to track a phone as long as it is on and has signal, but no you cant without a court order. Unless its an emergency and 911 has been called.