How to check for internal or performance damage after iphone 4s falls to the ground?

There's no physical damage or crack but I wonder if everything inside is okay… Is there a way of knowing or checking if there's damage?

I don't want to use my iphone one day and discover one of its apps or features fails…

It should be fine, if it wasn't hard enough to crack it it probably wasn't hard enough to break it. If you notice it running weird bring it in but it should be fine. No way to tell.

You don't. You simply use the phone and see if if starts acting up over time.

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