This is an AT&T landline phone handset from my Grandfather. I kept it sitting around for a while before I finally decided to take it apart to see what was inside.
After the case has been opened, you can now see the PCB and the speaker. ( If you already haven’t noticed, the microcontroller is under an RF shield to prevent from interference.)
To remove the PCB, use a Philips screwdriver to remove the two screws securing it. Then you can lift up the PCB and separate it from the plastic frame.
Now you can finally see the other side of the PCB in all its glory, with no important components whatsoever, except for a lone microphone and the awful LCD screen.