I've got a scratch on my iPhone 4. I've been looking at replacing the digitizer, but I do not want to buy one that is not assembled with the LCD screen because I've read that they're glued together. I do not want to have bubbles under my screen from assembling the screen myself. I have found a screen that has the digitizer and the LCD already assembled. However, it is an iPhone 4S screen. Does anybody know if it will work with an iPhone 4?