wandering minds why?
A mind wanders because something else is more interesting to it than the task at hand. It is a subconscious reaction, not a foreground choice. By wandering, the mind is finding some measure of happiness where none was. Given a pool of people with the same job, if those with an iPhone wander more often, who's to say the others would not have if they had a place for the mind to wander that was interesting.
Either they're wandering more often because the job bores them more (psychological differences drawing lines in the user base, aka, saying an iPhone owner is somehow different on some level from a non-iPhone owner in the same situation), or much more likely, the device OFFERS places to wander TO (or get to more simply or readily) that other devices do not do equally, and thus wandering is more easily achieved.
Now, if the study actually compared overall lifestyles of users vs non-users and found that iPhone owners suffered more common bouts of depression, or other disorders we might have some interesting information. However, them wandering more often does NOT logically equal that they are more depressed ad thus more frequently seek distraction unless you can quantitatively measure the ease of achieving distraction, and the benefits differences of what distraction might have been obtained when wandering.
Either the study's results are wrong, or more likely the analyst coming up with this statement was wrong. I content the opposite hypothesis: iPhones are superior at providing distraction and can make sad or bored people HAPPIER by having one.
Put me in an office with no windows and no distractions and I'll focus on my work more and wander less, but i'll also be far less productive and far more lethargic, and far less happy. I know for a fact I actually get more work done when my mind is allowed to spend 10-15 minutes of every hour doing something other than my assigned task at hand.