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I have my smart phone mounted on my windshield to use for Nav, which includes not only route planning and guidance but also congestion alerts. Because of this, I think it's reasonable to assume that it increases (slightly) my safety.
I have it mounted via suction cup to the top left corner of my windshield. From there, it's about 6" to my left eyeball.
This location is like having it as a Heads-Up display. I barely have to move my eyes off the road to look at it. So it's much less a distraction, and much safer than using a console/factory GPS for Nav.
I can see it out of the corner of my eye while driving, and anticipate the shape of the next intersection, or the direction of the next hairpin curve. Again, this improves my driving safety.
Also, having it at the top left, is the least obstructing. I've noticed that I have to move my head to the side to see something behind it, only about once a week. That location blocks things I need to see fewer times than my rear-view mirror.
I also make it a firm rule that I don't operate the phone, (Nav reprogramming, changing destinations, etc). or texting or phoning etc. unless I'm fully stopped.
When the gps is going I'd much rather have it mounted within line of sight of the road than sitting in a cup holder or between my legs.
On the topic of phone mounts, I passionately recommend the Go Grip car mount. It works with any phone, and it works fantastically. I am very picky about such products and this one gets my high approval.
I use mine coupled with an OBD II bluetooth adapter for real time monitoring. I monitor fuel pressure, oil pressure, oil temps, etc.....
A lot of radar detector companies now offer a module that connects to your smartphone that allows your phone to be the HUD for the detector.
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For GPS/NAV of course. 
