I use it if I am driving and it's not someone on my speed dial. I don't have a bluetooth phone, but it's a speakerphone, and it has voice navigation. Unfortunately, this is how it normally goes:
Me:"Contact...Bob...Mobile..."
Phone Display: "Did you say, 1. Mom 2. Bob 3. Hotel?"
Yeah it has a long, long ways to go still and I really don't see anyone getting 1 billion users anytime soon... Couple that with the fact that different phones have different specifications, and you'll have a great deal of trouble making a software package for VR that can work on more than a few models from the same OEM.