Mic on iPhone 4 not working?

I have the iPhone 4 running the latest iOS.
I can't talk, because the other person can't hear me. I can record voice memos, it comes out blank. But I can record my voice using the video recorder. It's a used iPhone, but the last time the mic didn't work was over a month ago.

Have it repaired.

I would definitely bring it to the Apple Store to get it looked at

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