Caller claimed to be from ADT Security. Said my phone number had been selected for a free home security system. I said I already had one and he asked if I wanted to pass the offer to someone else. I said I didn't know anyone who needed one and he ended the call. I don't know if the offer was genuine or if it was a phishing attempt but the caller was at least polite and courteous. I'd refrain from providing details on a cold call even if it wasn't a scam.