You can`t reuse old cases for iPhone 11 Pro Max, but there are alternatives
(iMore iPhone)

Best Answer: Unfortunately, you won`t be able to use an old iPhone XS Max case for the iPhone 11 Pro Max because of the new triple lens camera system setup. Old cases will cover up part of the new camera due to the new square shape, which requires a new cutout. You will need a case that is specifically made for the iPhone 11 Pro Max, such as the Spigen Liquid Crystal iPhone 11 Pro Max case. Go big or go home: Apple iPhone 11 Pro Max (From $1099 at Apple) Crystal clear protection: Spigen Liquid Crystal ($13 at Amazon) Your old case won`t fit because of that cool new camera The main, primary reason why your old cases won`t fit the new iPhone 11 Pro Max is because of the new triple lens camera system. This new camera has three lenses in a triangular formation inside of a square-shaped bump on the back. The dual-lens pill-like shape cutout on previous iPhone XS Max cases will be covering up the new Ultra-Wide camera unless you try something like cutting out a piece of the case to fit...