To get through college I work at Sears and before that I worked at Subway. Seriously, when you want someone to help you or take your order, GET THE FUCK OFF YOUR PHONE. There are other customers who aren't preoccupied I could be helping.
The worst is when they come up to you and ask you something while they're on their cell phone, and then when you answer them (and interrupt their conversation) they give the stare of death. Oh, sorry to inconvience YOU fine sir!