Japanese engineers have come up with a way of blocking the signals using wood panels containing magnetic material.
A quiet room
You could put the panels in cinemas, theatres or even classrooms!
You just couldn't yak on your mobile in a room built out of the panels.
In many public places in Japan - like trains and cinemas - people are asked to switch off their mobiles or put them on silent tone.
But there's always someone who forgets or ignores it.