Does jailbroken iPhone affect having warranty?

I have AT&T, jailbroken iPhone 4s. The mic does not work and i'm assuming it's b/c i dropped the phone a lot. I've been wanting to fix this for awhile, but i was afraid to go to the Apple store b/c the warranty might not work for me since my phone is jailbroken. I heard from someone that warranty does not cover only if it's water damaged. Is that true and does having jailbroken idevice affect having warranty?

Yes will affect warranty restore first save bloobs with itunes then sent to apple near store

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