How to Find Someone's Cell Number for Free

1. Contact mutual friends that you and the person you are trying to locate have in common. Ask the mutual friend if he has an updated phone number for this person. If the person is not comfortable with giving you the number, ask that he take your number and have the person you are trying to locate call you to give you the cell phone number.
2. Call the home phone number if you know it. Listen for an answering machine if no one picks up. Wait to hear if the cell phone number is listed on the answering machine as an alternative call-back option.
3. Sign up for a people-search service such as White Pages, People Search or Spokeo. These services list home phone numbers and cell phone numbers. Find numbers using the name of the person you are trying to locate. The more information you have, the easier it will be to locate the cell phone number if it is listed.