We frequently get lot of missed call and unwanted calls in our mobile phone or Landline. But sometimes we may not be in a situation to take the call and due to the delay it is disconnected. Whatever be the problem it is human nature to know where from we got the call or to know the importance of the call. In such cases we either call them back to know who called us. If the call is from a person whom you know than it is fine but if it is from some other person unknown to you, definitely it is waste of money and energy. Before calling, we can atleast guess whether the call came from someone we know if you know the location of the number. If the persons call is somewhere from a place where you do not know anyone, then you can ignore the call. But still we feel curious to know the address. Nothing is impossible with the use of Internet; yes through Internet one can trace the details. If you want to just known the network provider and State or Zone of the call, this Wiki directory of number can help you, which is updated regularly. http://en.wikipedia.org/wiki/Mobile_telephone_numbering_in_India Or else this link can help you in tracing the Location, operator, signaling of the caller by just entering the 10 digit number in the box provided. This site also shows you the exact location in a map. http://trace.bharatiyamobile.com/ (See the screenshot for more information) There is another site where both Landline and mobile numbers can be traced that gives Location,  Service provider details and type of communication. http://www.indiaonapage.com/mobilenumbertrace (See the image a landline number is traced) Other than these sites one can directly find by typing the number in Google search which may not work sometime as the details of the owner of the number may not be updated or outdated. There is also a reverse phone number lookup facility provided by many sites which are mostly meant for searching different numbers easily. Through Internet nothing is unachievable; one can also get information of sites which charge some amount to give complete address and details of the number. But finally these sites are useful for knowing the location and call cost, it is advised not to use misuse the numbers.