Verizon Wireless is the carrier for this number. Call up Verizon and tell them that one of their customers is using their services for illegal activity. Verizon MUST follow-up and investigate and block them and all those from CELLCO (a Verizon affiliate) from your number. They just did mine. Verizon will give you a song and dance how they can't go around monitoring their customers activities. You tell them that that these customers are conducting illegal activities and it is their responsibility to do something about it.