HiveMind: Electronics etiquette

Please, no cell phones

A few days ago at a computer store in Toronto, I spotted a sign posted near the cashier. It read:

As a courtesy to the cashier serving you and those waiting in line behind you. No talking on cellphones while purchasing items.

It reminded me of this sign forbidding laptops in a Marais cafe.

What do you think? Should stores tell their customers how and when they can use electonics?