Who called from 8182064221

Called me but I didn't answer. Didn't leave voice mail.

Same thing. Called, but didn't leave a message.

Picked up call from this number but no one responded when I said hello...

Received call from this number with a male voice asking if I was A--- P-----.  I said yes and he hung up.

That's confirming your name to go along with your number, which might fetch a higher price from third party pests. You ever wonder how somebody you've never talked to before knows your name, you gave them a lift. Don't give out any personal information unless the call pertains to you and the caller identifies themselves.