Called on 4/29/16. Didn't answer, caller left no message. Since the exchange can't start with 1, numbers like this must always be spoofs, meaning that you should never answer them and always block them.
Other
2
May 3, 2016
(415) 187-5874 Called today. Blocked because they did not leave any message.
Other
3
May 4, 2016
Obvious con artist since this prefix does not exist.
Telemarketer
4
May 12, 2016
Hang up.
Other
5
Aug 23, 2016
EXACT NUMBER WITH DIFFERENT AREA CODE 4081875874 WTF?