Can I use a screen protector with with the white iPhone 4?
Our testing has shown that the white iPhone 4's proximity sensor does not work properly with many screen protectors, including the ones included with our Clear and Mirrored screen care kits. While a Clear or Mirrored screen protector is applied to the white iPhone 4, the iPhone's screen will not sleep properly during phone calls. No other functionality is affected.
Griffin's Matte and Privacy screen care kits do not appear to have any affect on the functionality of the iPhone's proximity sensor.