If you put a phone in a microwave, shut the door and ring it (from another phone of course) then it will ring.
If you wrap your phone up in foil and put it on a table and call it, it will not ring. Faraday or something.
I heard this once and tried confirmed the above.
Don’t know what that all means as I am a bit fick.
Anyway, Mrs B has one and she has been known to be a dozy bint on occasion, my mate does and he admits he is a nutter, I don’t have one…