I've been getting hang up calls from this phone number for a week now and I noticed when I answered my phone the more they would call! When I call it back it says the number is invaild or its disconected! I live in Orange County CA and I've noticed some people from oc have been saying they have been getting calls from the same number. Is there a way to block it from a cell phone? Or is there a law enforcement agency that should be notified?