2 questions: 1. Can the camera lens on a Samsung Ace 2 be replaced? Mine is scratched. If you've had it repaired before, what was the approximate cost? 2. I bought an SD card for the camera and the other day it just stopped working. Is this common with the phone, or is it more likely the card? Both the phone and the card are 3 months old; the card is a Nexxtech. TIA!