Actually the iPhone 4 LCD screen is compatible with iphone 4s' but the frame not. If you can replace a iPhone 4s frame on the iPhone 4 LCD screen, it can works also.
But what you should mention is that if your new purchased screen is original, it's difficult to separate the frame from the screen. And mention that what the version of your phone because the frames for 4s and CDMA are different, buy the right one.
So good luck to you.
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