I doubt if you could trace it .. cos some time back a thief had broken into my friends house and he took many valuable items and also his mobile. Since he couldnt find his mobile he rang his no. to find it was lying some where around. Guess who answered.. the thief and he had the audacity to explain him how he broke into his house... and he kept the converstion with him for  two day and during this period police couldnt even trace him.. all they could show was a helpless face !!!