Honestly if I had more time I could probably get five pages form that alone. You'd have to delve into individual case studies even if they were fictitious, and you'd end up waffling about how Subject A would be constantly checking their media device for the time, new messages, missed calls, clearly deluding themselves that they were popular or just wanting to reaffirm themselves that they weren't missing out on any big events.
Subject B, chatting away on their mobile, LOUDLY, as if the phone was an extension of their personal space and encapsulated their obnoxious and pointless phonecalls in a bubble of soundproof air. Which it doesn't the feckless basts. Oh but they have another call and instantly switch demeanours because this is someone they can't just scream at with their braying rising-inflection-tainted voice and so on.
Okay, I thought I'd go further with that, into how the devices have become as ubiquitous as the pocket watch was and how we've become so enamoured with our always-on, always-accessible society that we feel underdressed leaving the house without at least fifteen goddan ways of being contacted, then wonder why people are so stressed.
But that's probably beyond the remit of a three-page essay.