I'm deciding to install the film on my iPhone 4. I have one iPad screen protector from power support(Anti-Glare). it works great! but I've never tried the crystal film. If I know correctly, the power support anti-glare film is the best quality compare to other products, but I still not be sure about how to compare the crystal films among other brands. Which criteria you used? They are definitely transparent while you can see the difference of noise amount in the anti-glare film. However, I saw the sticker, the "AFP" technology, on the power support crystal film package. I am wondering this can really help me protect my iphone screen from a finger print? Thanks!