Personally I've always doubted the studies saying hands-free was as dangerous as holding a phone to your ear. After all talking hands-free should logically be not much different than carrying on a conversation with a passenger, and perhaps even a little safer because you nullify your instinct to look at the person you're talking to when they're not there. On the other hand it's pretty stinking obvious that you have less control over a vehicle when you're only using one hand on the steering wheel.
Now texting and driving....That's the act of the stupid and the insane. Ditto for using whatever social media app is currently popular.
Personally when I'm driving my phone stays either in my pocket, in the console storage cubby (if I have it plugged in to charge), or in the mount on my dash (if I'm using GPS, in which case I make my wife fiddle with any settings that need fiddled while I'm driving).