The Apple 12 and 14 cases are not universal,
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Although the size of the Apple 14 and 12 is 6.1 inches, but because of the 14's camera and buttons and other design changes, so the previous 12 phone case can not be used on the 14.
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The iPhone 14 has a diagonal lens layout, while the iPhone 12 does not, and the iPhone 13 is more square. When the iphone12 case is placed on top of the 14, the camera will be pushed up, which is more obtrusive.