If you want to know the location or area of any mobile number from where it is operating, you can check it here. It is also useful when you get a miscall of unknown people and want to know from where the caller belongs.
You are required to only fill first 4 digit of mobile number in the field in the above linked website. It will be sufficient to give information about location, Operation service provider and technology used for that mobile number.
Now, many mobile subscribers in India and Pakistan are getting unwanted calls from advertising agencies in the form of recorded voice ads. So before responding the missed call, better to know about caller’s location.