A lot of people would be lost without their smart phones.
I have and use one but I rarely look at it when in the company of other people... And never at work or on a customer site.
A few years ago a "manager" for the company I worked for was checking his email on his smart phone during my performance appraisal meeting.
To say I was pissed off is an extreme understatement. (Not my doing but he's no longer a manager
)