Caller ID read UNAVAILABLE. Robocaller was pitching a wireless alarm system and they wanted you to answer yes to a question which would no doubt result in charges being placed against your credit card, debit card, or phone account. There are many reports of this being a common criminal scam now.
I got the same wireless alarm system pitch from this cellular caller. This is likely one of the "Say Yes" scammers. Best course of action -- don't answer the call. It's a thief who wants your money and/or identity.