Who called from 3605874710

I've been getting calls from this number for the last two weeks. In the last week they've gone from one call daily to two or three daily. No message is ever left and I won't answer it because it's not already in my contacts so therefore I don't know the number.

Who is this?

This person has called me four times today, but doesn't actually leave a message.

I have had 6 calls from this number in 2 days, they have not left any messages

I think i got about 6  calls in the last 2 days, 4 of which during school