GPS capable phones have been around for a while and are an absolute godsend if you have a sense of direction that is as bad as mine. The downside is that I have to rely on other people's GPS enabled phones because I'm still living in the Stone Age. If the FCC has its way --which it will, it just ruled on this-- all phones will have GPS come 2018.
Why? The reason they cite is for the purpose of tracking 911 calls. Whether or not that's just a smokescreen depends on your personal level of paranoia and frequency of illegal activites. Currently, if a non-GPS enabled phone dials 911, the provider has to triangulate the location, which is annoying and inefficient, apparently. Straight up GPS is just much better for figuring out exactly where you are, however that makes you feel.