When I was a manager, here's what I told my department heads..
"I don't want to see phones on the salesfloor in view of the customers. I totally understand that you may need to access your phone during your shift, and I have no issue with that, but just do it in a backroom area. I have young kids, and my wife WILL call me throughout the day, so I don't expect anyone to not take a call. But do it out of view of the customer."