I know how to install a faceplate for the a670.
1. Pop out the round disc things on the inide of the screen
2. Use a small phillips head to unscrew both of the screws (keep both the screws and discs nearby)
3. Use a flathead screwdriver and starting near the "hinge" with ur phone closed, pry around the outside.
4. Once remaoved use the flathead screwdriver to pry off the
lcd screen on the stock faceplate.
5. Using the doublesided tape that came on the inside of ur new or old faceplate...reattach the
lcd cover to your new faceplate
6. Slide the facplate on making sure that it covers the area above the earpiec befor u clip it in place.
7. Replace screw and discs and enjoy
I hope this helped and the best place to find small enough screwdrivers are in home depot although I got mine in an xmods tool kit.