My caller ID came up Security Check.

Called and left no message -  Caller ID said Security Check - number now blocked

Just got a call from this number and didn't answer because I don't know anyone from CA (I live in TN) they didn't leave a message so I called back and a mans voice said "hi, this is Jim. Thanks for calling me back" it was obvious the voice was recorded. I also used *67 before the number so the person wouldn't know my number. I'm so sick of getting these calls.

Did not answer?

Caller id, security check. Answered speaking what few Korean words I know.  They disconnected.  Blocked #.