It's a VoIP number.
Originally Posted by Nicolet
Voips, Cells, Google Voice, etc, all have same issue with the numbers not actually published by the carrier/subscription service. Thus, unless someone publishes their # by listing it somewhere, which somewhere happens to get posted (ie, address list of high school class of 1901). Even with this, folks change #s due to numerous civie reasons (switching carriers due to pricing, lost phones, etc.). Thus, an internet look up could very well turn up whomever previously had the number, not your actual target.
Even security professionals have this problem, as the best they can come up with (unless lucky) is the carrier (or wholesale provider) and perhaps a city. And this is all the subscription lookup folks can do as well. Example: Google Voice uses a sub-contractor. As trivia, this is the point where the jelly doughnut eaters issue a warrant to the carrier/service outfit.