1.The speaker had fine steel chips in it, that caused it to loose its' volume.
2. The back was badly scratched on the camera lens.
1. I used the 4, 4 CDMA, and the 4S pictorials. It was not necessary to remove the on / off switch.
2. The new back was exceedingly tight, to slide all the way into place.
Well! It fired up correctly the first time.
Maybe to put an ink mark on the clip that coverts the camera, so you remember the direction it fits in.