If you are in India and got a Called 'Missed', than you could certainly Track the Operator Area / Zone of the GSM / CDMA Mobile Phone from where that Mobile Call did originated to you.
To track the Missed Call Operator / Zone just enter the ONLY first 5 digits of the Missed Call number and click Submit at below link to get the Operator name and the concerned Circle to which the number belongs to.
http://informationmadness.com/cms/index.php?option=com_content&task=view&id=40&Itemid=49
Unfortunately these Mobile Code Tracker Only works for Indian companies right now, not for my Global audience : ( but please have a patience I will provide you the links for Internationals too as it hits the net...
Cheers...