http://money.cnn.com/2007/01/26/magazines/business2/gpsservices.biz2/index.htm?postversion=2007012617

"It's estimated that, by the end of this year, as many as 63 percent of phones sold in North America will have built-in GPS chipsets, up from 55 percent in 2006, according to Gartner Research.

Within the next couple of years [by 2009], we envision that navigation functions will be a standard on mobile phones."