iFixit

Remove the following 3 screws:

• Two 1.5 mm Phillips #00 screws, one on either side of the dock connector.
• One 2.4 mm Phillips #00 screw near the ribbon cable labeled "4."

Lift the dock connector assembly up and out of the iPhone.

When inserting the new assembly, ensure the screw holes of the assembly rest ABOVE the bezel's holes.

In the following steps, you will partially remove the silver bezel attached to the rear panel. If the residual adhesive is not enough to hold it together during reassembly, it may be necessary to apply a light layer of glue around the inner edge of the bezel to keep it secured against the rear panel.

Insert the edge of an iPod opening tool into the gap between the silver bezel and the front panel on the volume button side of the phone.

Run the edge of the opening tool along the seam to separate the two components. The goal is to lift the silver bezel enough to push the volume button into the rear case.

Once you have lifted the silver bezel enough to clear the volume button, use the edge of your opening tool to push the volume button toward the inside of the rear panel.

Remove the volume button.