I dropped my iPhone 6 and sound doesn't work at all?

So I dropped my phone in the hallway. Screen protector cracked, but seemed fine. However, music/podcasts/YouTube won't play with headphones or through speakers. When I call people, I can hear the ringing, but the other person can't hear me. I've already tried restarting my phone.

Time to hit a repair shop and see what they can do or take it back to Apple if it's covered by Applecare.

You will have to replace it. I know - bummer. You're not alone, I did the same thing last year.

Take it to an Apple store and ask them to figure it out.

No question, then?

I think there's some kind of issue with the sound system of your phone. You need ask some professional cell phone repairer to check it out.