I'm pretty sure this is the same number I got junk calls from a couple of weeks ago. The pitch was from Diamond Resorts (they said in Las Vegas even though that doesn't match area code) to try out a timeshare in Las Vegas. Might be a local caller working for them or a fakeo number they generated.
Received call from this number: 415.900.3934. Phone back and reached a recording from the "customer care" unit with the message "we cannot assist you". This came in on my cell phone; my number is on a do not call list.
I called it back and was a solicitation for a gift card.. was able to work through their menu to be on their do not call list.. something tells me they will call again anyways..