iFixit

Use a spudger to disconnect the ribbon cable labeled "5."

Use a spudger to disconnect the ribbon cable labeled "6."

If you have an iPhone 3GS, refer to the second picture and use a spudger to disconnect the ribbon cable labeled "7."

Carefully peel up the small sticker labeled "Do not remove."

Remove the following 8 screws:

• Five 2.3 mm Phillips #00 screws with partial threads securing the logic board to the rear case.
• Two 2.3 mm Phillips #00 screws with full threads securing the logic board and camera.
• One 2.9 mm Phillips #00 screw from beneath the "Do not remove" sticker.

Note for re-assembly:

• The screw that goes next to the camera (bottom right orange highlighted screw) also has a metal strip that holds the camera in place.
• Remember to put this strip back in place before you insert the 2.3 mm Phillips #00 screws with full thread next to the camera

Use a spudger to gently pry the camera up and out of its housing in the rear case.

The camera cannot be removed entirely yet because it's connected to the bottom of the logic board.

Use a spudger to gently pry up the end of the logic board closest to the dock connector.

There is a small golden grounding tab on logic board adjacent to the 'do not remove sticker'. Be VERY careful this does not snag on the side of the case when prying up the logic board; it breaks easily. If you have signal problems after removing the logic board, check this ground tab.

If the board won't lift up, double check to make sure all the screws securing the logic board have been removed.

Slide the logic board towards the dock connector and out of the iPhone.

When replacing the logic board after installing battery, connect the camera to the logic board before inserting it into the case. Then make sure to set the top section of the logic board (where the SIM tray is) in place before settling the rest of the board in place. This is important, as sometimes the SIM card slot will not align into place. Once the top section is in place, the bottom section can be maneuvered into place. You will know the logic board is correctly installed when the SIM tray is aligned with the opening in the iPhone case and the camera module seats neatly into its place.

Use a spudger to pry the battery up from the rear case. The battery is attached with an adhesive strip around the perimeter of the battery. To prevent the battery from bending during the removal process, we recommend against using just the plastic pull-tab . *Note: Removing the battery is NOT necessary for replacing the GPS antenna. It merely gives you more space for removing the headphone assembly (which is also unnecessary to completely remove).

The iPhone's battery is attached to the rear case with a mild adhesive. This adhesive usually comes out attached to the battery. If your replacement battery already includes an adhesive backing, you're all set. If your replacement battery doesn't have an adhesive backing, you'll want to transfer the adhesive from your old battery to the new one.

You can use a hair dryer or heat gun on its lowest setting to heat the back of the case. This will help loosen the adhesive bond before using the spudger to separate the battery from the case back.