Here are two databases that can assist in helping the user determine if a phone number is a landline or mobile number.
+ + FoneFinder
Learn service provider and exchanges. Search by number, city name, Zip Code. International info also available.
See Also: World Telephone Numbering Guide
Note, “special services” section.
See Also: Area Codes in Radius (via MelissaData.com)
See Also: 900 Number Master Report
+ 500 Number Master Report
+ 555 Number Master Report
+ Area Code Info
Source: NeuStar
