Apple lists all of its new iPhone 8 and 8 Plus cases as compatible with the iPhone 7 and 7 Plus
The new iPhone 8
and 8 Plus
come slightly taller, wider and thicker than their iPhone 7
and 7 Plus
predecessors. The differences, however, are a fraction of an inch, so if you have been wondering whether your old case will fit the new phones, it probably will, at least according to Apple's official accessory page. We just took a peak, and there the iPhone 8 and 8 Plus cases are listed as compatible with the 7 and 7 Plus. Oh, the joy.
Not only Apple's, but also all third-party wrappers from Otterbox and others are also listed as compatible with both phone generations, so if you have been thinking of keeping your favorite case you now have on your iPhone 7, and upgrading to the iPhone 8, for example, you will probably be able to fit the new phone in the old case without the help of a heat gun.