In reply to S Taylor.

Let me submit that the iPhone is not a telephone. Sure, calls are one of its capabilities, but I'd argue it's more of a personal computer (evolved) than a phone. Personally I use the other features of my iPhone (web, maps, music, etc) at a 20:1 ratio to making calls. Your question is a great question... I'm not sure they (phone calls) will remain vital. Sure we will still communicate by voice (and video), but consider how many calls are now avoided due to a text, and IM, an email, a social media post, etc. I think this is an irreversible trend...