On 16/08/2011 9:01 PM, Man-wai Chang wrote:

I threw it into a tin can then invert it. It still rang when I dialed
its number.

Must I use aluminium foil? Why does Al make a difference?


Had to test it
In a tin can (tea can 2x2x3") fully closed: no reception
Overlapping lid only 2 mm open: reception
Microwave: no reception

Tony