How is the warranty on your iPhone checked the Apple Store?

I had the headphone jack replaced my iPhone by another company (other than Apple) a couple months. Now I'm having problems with the home button. If I bring it in store Apple to repair / replace, will they be able to tell the store that my warranty is void?

Not unless the other company you took to share their data with Apple. If they are an authorized service provider, they could, but the guarantee would not be canceled. If they are not, why they share that information with apple? For their customers angry against them? I do not just go to the Apple store and says nothing into the headphone jack. Even if there was a way for them to find about it (maybe a non-OEM setting), they probably would not find unless they were looking for him.

How to manually force your iPhone out of Headphones Mode