iPhone 1st Generation Antenna Cover Replacement

Using a SIM card eject tool or a straightened paper clip, gently push into the small aperture located adjacent to the headphone jack.
Using gentle pressure, depress the paper clip to eject the SIM card tray.

Using your fingers, gently extract the SIM card tray from the iPhone by sliding it outward.

To detach the antenna cover, depress both upper tabs, which are visible beneath it, inward toward the black housing; this action disengages the two catches securing the cover.

Carefully insert the metal spudger in the space separating the antenna cover from the dock connector, avoiding the connector's internal components.
Using a metal spudger, carefully separate the antenna cover from the front bezel by inserting the spudger into the space alongside the dock connector and gently lifting upward, focusing on the areas near the two tabs to establish a slight separation.

Using an iPod opening tool, carefully separate the antenna cover from the front bezel by sliding the tool’s wedge shape against the cover.
Using the specified tool, maneuver it along the corner and advance it upwards, stopping when the metal backing is contacted.
Perform the identical steps again for the remaining connector side.

Applying moderate pressure to both sides of the antenna cover, move it upwards to release it from the iPhone.
If the cover resists removal, raise the antenna cover to disengage the retaining clips.