That application you downloaded is brilliant; superb; a life saver. You’re lost and your iPhone is the key to salvation. Except it’s raining so hard that it’s actually bouncing up and soaking you. You’re glad your phone is safe and sound inside a case because you can hardly make out the map for the splashing of the downpour, iPhones and rain don’t mix as well as you hope the drinks are at your journey’s end. You can make and take calls right through the case material. With most phones it makes no noticeable difference to the volume.