It works swapping iPhone 4s LCD with iPhone 4 no doubt just have to swap mid bezel frame from the LCD from your iPhone 4 to the iPhone 4 s everything works apart from one little fault and it's not a used or cheap replacement screen it's from apple direct it will have a very faint white line running along the top of screen never bothers me but I would recommend always using the correct parts for the specific model to avoid any defects this is only essential if you really have to use a slightly different modelled screen hope that helps ;)