Who called from 3153203133

Called, left no message.

Strong accent - I could not understand where he said he was calling from after asking him several times. Then he asked if I was the one calling about knee and back pain.  I told him he had the wrong number - and I hung up.  I have had 4 or 5 calls from this number in the past week.  This is the only time that someone was actually there when I answered.

What they say not important or ? Why you give them my num for?

Called when I wasn't home.  No msg.  I would not have answered anyway.