[Mannaggia l'America]

Yes they can. We have to check for this during development of computerized medical devices. In some cases incoming rings or pings to cell phones will interfere with computers.

But I don't think it's going to bring down a hair salon...

[battlegearboat]

I dare not ask my barber to turn off his cell phone during my haircut.

[Kirkwood]

“But I don’t think it’s going to bring down a hair salon...’

But it does temporarily interfere with wireless medical devices when they are monitoring or recording data. If you bring in hundreds of cell phones into a hospital, the chances of this happening go up significantly.