You can also google the National Do Not Call List and enter you phone number(ie home, work, or cell) If you receive a call make sure you write the name of the individual you speak with, date and time. Then if they call again you can file a complain with the National Do Not Call list. I have done this with three other phone numbers. Charges were dismissed off my home phone and cell phone bills
I picked up a call from 402-982-0719 on my cell phone and a male voice started selling me. I asked if it was a sales call and he said "no" but he continued trying to get me to put a sign on my front lawn in exchange for free security products. The guy was unrelenting. I hung up.