This is the speaker used to listen while phone is held up to your ear.
Remove two screws securing the front-facing camera bracket to the display assembly.
One 4.1 mm Phillips screw
One 2.2 mm Phillips screw
Remove the earpiece speaker bracket from the display assembly.
Remove the earpiece speaker from the iPhone.
There is a small, black plastic spacer underneath the metal bracket at the upper screw. The upper screw goes through the metal bracket then through this plastic spacer.