When Codys razr got stolen... back when razr's were the big thing, he just called his phone company (cingular then) and told them the situation. they printed out the call log on the phone and started calling those numbers asking for the person that called them from that number. however you want to present yourself to them is up to you but i would definitely start there.
well again, this was a while ago..lol. You can log onto your phone account online and gps track it. each phone has a serial number embedded in a chip that doesnt change. even when the sims card has been changed.
Thnx for answer felican but what if he or she changed the chip..?
any time darling.