To all those people who say you shouldn't use your phone while driving, I agree 99%, but:
What about navigation?
For those who say "use Siri"...
What if you use Google Maps?
Not every use-case is the same.
In the UK it is totally banned for the driver to touch a phone for ANY reason BAR a 999 (like 911) call. And that includes when your stopped in traffic and navigation. So here it makes no difference as it should be.
Your driving a car, with a mass of say 1.3 tons at 50 to 60 mph about a couple of feet or less apart from another car doing the exact same thing coming from the opposite direction, it only takes one tiny lapse in concentration and BAM! A closing head on impact of 100mph plus.