Back of my phone is smashed
How much will it cost to repair my iPhone?
iPhone 11 Pro Max, iOS 14
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Prices below. Depends if you took out AppleCare+ and if they consider this "Severe Damage" or "Other Damage"
https://support.apple.com/iphone/repair/service
If not covered by warranty and you don't have AppleCare+, you may have to pay full replacement cost for severe damage