If it is a cell phone number, whitepages may not be able to give you the name of the person but often, they can tell you where the phone is registered (area as well as phone carrier) so you can get a general idea of where the call is coming from.
However, by putting the full number into Google, even if it is a cell phone, you may get a name if that person has ever posted their number online.
Put all the information you have into a Google search and see what you get. If you're meant to be together, the universe will bring you together again.
You can also put a posting on facebook and ask people to repost it. Eventually, the person who's number it is may get back to you.