To trace the location of a mobile phone number, use a GPS tracking application. To trace the location of a mobile or landline number, perform reverse phone lookup using websites such as Whitepages and 411.com.
To use a GPS tracking application, first locate and install the application on a smartphone or touch-screen device. Choose the mobile tracking or tracing option on the application, and type in and search for the mobile number whose location you wish to identify. The search result should provide the city and state of the mobile phone number. Some GPS tracking applications may charge a fee for the service provided.
On the Whitepages and 411.com website, click on the Phone tab, and type in the phone number in the box provided. Click on Search.
The search results on both these websites reveal the city and state associated with the number at no cost. A map pinpointing the exact geographical location of the phone number is also given. The name of the telephone carrier is provided for free. However, these websites charge a nominal fee to know the name, address and other details of the owner of the phone number. The sites permit users to report the number and leave a comment regarding the caller.