Clever!

But what the video doesn't say is that you need to rotate the can/phone until the open (front of phone) is pointing at the nearest cellphone base station. If you don't know where that is, try rotating SLOWLY whilst watching the signal level icon on the phone. Make sure as few objects, (metal, walls, people) are in the line of the phone to that distant cellphone base station as these soak up the signal.

SMS's will often get through when signal levels are much too low for a conversation.

You can attach a headset once you've got the orientation right. If your headset has a call answer button you won't need to pick it up. Better still if it has voice-activated dialling.

But a proper directional external antenna will give even better results.

RS