Phones: instant access to knowledge and entertainment. Fulfils the need of the human brain for both. If you cannot put it down and chat to the person next to you maybe it is the person next to you. Maybe they are boring! Like I am! lmao. Seriously though I believe the instant access to knowledge explains the phone in most peoples faces. Look at how amazed 6 month old and older babies are. They want input, be in parents, TV, wanting to pick at you phone and push the buttons.
P.S. Came here from ListNerds