Paper White Pages directories generally contain residential listings and are not likely to list cell phone numbers. The website Whitepages.com, on the other hand, may work when looking up a person's cell phone number.
In addition to using information from published telephone directories, Whitepages.com gets data from third parties that compile information from subscriptions, sweepstakes and contests. These data may contain cell phone numbers, which some individuals list as their primary contact numbers. You can also use Facebook to look up a publicly available cell phone number on a profile, or do a reverse lookup by entering the number into the search bar.