Most unexpected use:

One day before our put-in on the Grand Canyon. Our trailer light broke in Kaibab, no parts to be found. Shuttle company specifically states they will not shuttle trailers that aren't 100% working.We would have been screwed on our trip that we waited 15 years to take. I took a photo of the bad parts, emailed to my son in Phoenix, he was able to match up the part at an auto parts store and bring it up with him that evening. You can't do that with a not-smart phone.