Once the back has been separated from the rest of the device, carefully place it to the side. Be careful not to completely remove it, however, as there are wires connecting the back to the handset.
Remove the earpiece speaker from its resting spot on the front of the device. Be careful not to remove this speaker from the device entirely before moving to the next steps.
Use a soldering iron to loosen the soldering on the contact points. If heated properly, the contacts should be loose enough that the speaker can easily be removed.