Pranav Mathur was correct. I replaced the battery on a phone and at that point I had no speaker. I looked carefully over every part of the phone to make sure I didn't rip or damage anything (It's rare, but it happens, lol). When I found nothing, I looked at the connections and squeezed the phone while it was on to see if I got any sound and sure enough, I did! The battery that I used to replace it was flat and the old one was curved and thinner. After shaving a little of the frame off (I actually used a wire cutter I had on hand and nipped pieces away) and bending the battery slightly, I had sound! Hope this helps! At least it confirms the prognosis of Pranav Mathur.