I don't use a phone while driving/ riding. I am, in way, so important that anyone 'needs' me in a hurry. And anyway when I'm out, 'I'm out. I always drive / ride with a satnav on. Me, being excessively dim witted, need the Sat Nav to remind me what speed limit I am in and to shout at me when I go over it. I approve of any gizmo that anyone else finds useful. Reviews, even when impure, bring these items to our attention, to pick up, examine, put in our shopping list or leave in the 'forget it' box.