Robo-call? Caller would not respond when answered, but would call back immediately as soon as would hang up. I suspect it is one of the Obamacare telemarketers who have essentially stolen people's numbers.
Robo Call, Asked If I preferred Trump or Clinton (you know the routine). Answered that I preferred Trump over Clinton and then cut off. Did not ask gender, age, party affiliation.
Called twice after 7pm within 20 minutes. I don't answer numbers I don't recognize. When the machine picked up, they didn't leave a message. C.I.D. said Milwaukee, WI but any caller I.D. number can be spoofed. We can't trust the C.I.D. any longer.
No idea who is calling but I must assume they don't have any legitimate business with me or they'd leave a message.