Locating phone using phone number

I want to locate particular phone by using phone number. can any one guide me how should do it?

How accurate does the location need to be? If you're trying to get something fairly approximate, check out the android geolocation guide.

Getting a location merely from a phone number is much more difficult/not useful. You can narrow down country by country code, then hopefully said country uses area codes to make it a little easier. Of course, nothing about any of this means the phone is currently even in said country/area code.