I forgot to add that for me it is a necessity. I ride because of my heart needing the health benefits. I have three stents after a MI for clogged up arteries. When I started riding I had a LOT of anxiety attacks of "what if". Thankfully I have never needed it but there is always the chance. I am in a 1000% better shape for the riding and I dont worry the what if anymore but I do love my iPhone.