Answer to "Why can I only hear a call over speakerphone?"Opened the phone is when I unsecrewed the bottom screws and used the suction cup to lift the display out of the socket.
Answer to "Why can I only hear a call over speakerphone?"I had the same problem and I fixed it. I just opened the iphone because my wifi no longer works. When I closed it up well the place were you hear the calls did not work anymore. Well the trick is to make sure your connector 3 is well put back in place. It is the orange flabby one behind the number 2. Before you pop the 2 back into place you need to put the 3 in. Lift the white tab on the logic board. It might be already lifted and then insert the 3 into it. Like putting a piece of stick gum inside your mouth. Then close the white switch back down and it should lock the 3 into place. Then proceed with the 2 and then 1. This will surely fix the issue.