I dropped my phone. Now I can't hear or be heard on calls. Any ideas?

I dropped my phone yesterday. Everything works fine, except that I can't connect to a call. I can make the call, it rings for the person I'm calling, the phone thinks it is connected--it starts counting time on the call--but I can't hear them and they can't hear me. There isn't dead air like there might be a sound--there's just nothing. People can call me, it rings, I can answer--but again nothing.

Texting works fine, microphone (I made a voice memo to test it) works fine, speakers work fine--it's just during a call that it doesn't work.

Any ideas? I haven't reset it yet--didn't know if that would help what seems like a hardware issue, and want to avoid waiting 18 hours for all my music to go back on it.

Any help would be much appreciated!