Allow us to tell if a phone number is a cell, land line or fax etc.
Stephen J. Engasser commented
you can use http://www.SpyDialer.com to see if it's a cell number or not. This site will call the number without having the person's phone ring. It will record the first ten seconds of the voicemail and you can play it back so you know who you are calling. In the first ten seconds is when someone says in their greeting who they are. Good luck.
the blanks for phone numbers could be labeled "cell" or "mobile" or "home" or "fax" or "office" etc.