I remember that when I purchase sd card for my dslr camera, and many sifu advice me to format sd card properly using the Panasonic application for computer which number can download from Panasonic Site. So I think it should apply for hand phones too. Here is the link. The proper format will help. My current sd card works fine. I old 4gb from my old phone. I don't have to re format. Just my 2cents.

http://panasonic.jp/support/global/cs/sd/download/index.html

I'm using the Ultra Nano Clear. Not much of finger print also. The best of both worlds I think. It didnt cover the beauty of the original screen. I put side by side with another naked screen, friends cant tell the different beside the lines of the SP on the side.

I found out that the headphones that comes with the phone have problem with the mic. I tested with the my tab headphone is ok, will ask for replacement from Samsung this week. The mic pick husky voice from me ha ha ha ha ha.