Wait, What?

I was in a doctor's office and they had a sign in the waiting room.  I don't remember the exact wording, but it asked patients not to use their cell phones.

I honestly don't understand.  We're bored out of our minds waiting for the doctor (usually way behind schedule) to call us in.  And his magazine collection is nothing to write home about.

We're not at a movie theatre, or driving a car, or in line waiting to order.  We're just sitting there, doing nothing.  Why should we be prevented from using our phones?

If the doctor means we shouldn't make noise, fine. (Though even that would seem a little odd.) Just put up a sign asking people not to talk on their phones.  They should be allowed to text, or play games, or avail themselves of all the information in the universe.

Is the doctor just mad we might entertain ourselves, or even do something constructive, rather than sit there, wondering how the blood panel went?