Updated August 23, 2017 Check a reverse phone number lookup service such as White Pages, 411 or AnyWho. Some cell phone users have opted to list their phone numbers with these or other online services. Search for the 10-digit cell phone number on Facebook. Many users list their cell phone numbers in their profile information. Even if the caller’s privacy settings prevent you from viewing his profile, if there is a match it is displayed as the top result. Check an online search engine such as Yahoo Search, Google or Bing for the 10-digit cell phone number. Because the results are sorted by relevancy, you only need to review the first few results. Send a text message to the cell phone number and inquire about the owner’s identity. Identifying yourself in your initial text message increases the likelihood that the recipient will respond in a positive manner. Access the Spy Dialer website and enter the 10-digit cell phone number in its online tool. The site dials the number and makes a short recording of whoever answers the phone. The recording is then made available to you to listen to on the website. Listen carefully to determine if you know the person.
