Black square hard plastic from iPhone 4 repair
I was replacing the home button on my iPhone 4 and this piece fell out. It's made of hard black plastic, does anyone know where it goes? It measures approx 1.5mm
here is a picture of it below
i think i know where it comes from,
could be the little rubber that protects the mic ribbon cable.
you can see the piece on this guide
you can see the piece in picture 23, 24 and 26 next to the mic, lift side on the ribbon cable.
your phone will work fine without it :-)