To function in society? A few years back I did everything with a dumb phone sitting on a desk with a line running to the wall. Has society progressed so much that a handheld computer is now required to function? You don't need a phone at all, it's a convenience that some folks seem unable to do without, but I occasionally leave home without my iPhone and there have been no issues.

Then again, maybe I'm an anomaly; I use cash rather than Starbuck's barcode app. I don't text and folks who send text messages to me get nothing in return. I do use the phone to preview emails and send notes to myself, but it's nothing I couldn't do with paper and pencil. Occasionally I will also send myself mp3 files and listen to them when I have nothing else to do, but is that a requirement to function in society? No, it's not.