Yes! I read commentary a while back that said the size of the phone is roughly (w/in a factor of two) the size of a cigarette pack and just like the pack, is almost always within arm's reach and frequently sought.
Can't recall the exact source, but the conclusion of the article was: if you want to kick the phone habit, first of all, keep it out of arm's reach.
What do smokers reach for when they wake up? Their cigs. What about everyone else? Phones.