Who called from 6175811968

Has called twice this week - very early on a weekday and again on Sat. afternoon. No message left either time.

Annoying call from this number, early in the morning and did not say anything when I answered.

Received call on home number early morning. did not pick up. Caller ID says Unknown. Caller hung up when answering machine came on.

I called back and there is no way they will answer.

Called 3 times in a 4 hour period, doesn't let the phone ring longer than a couple rings. Caller ID says private number.