I bought a "dumb" Symbian phone and it has "fake call" functionality. It even allows you to configure which button to press and the timeout to wait for the even

I bought a "dumb" Symbian phone and it has "fake call" functionality. It even allows you to configure which button to press and the timeout to wait for the event. If you answer it, you just hear nothing but it won't hang up on you. It's well worth the steep price of $5.