If an Iphones back is cracked/shattered will it effect the Iphone itself?

If the back of the iphone is cracked (picture) will it effect how the iphone works? I'm buying one from a friend of a friend and just wanted to make sure if anyone knows for sure.

No… Altho iphones are utter shi. Any way. All you pay for is the word apple. There are far superior devices out there

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