NeighborhoodThreat
Bluelight Crew
On my cell phone, if I don't know the number (doesn't matter if it's an unknown), I won't answer it. I pay per minute, so they can leave a voicemail if it's important.
On the landline, I'll answer sometimes--It really depends on my mood.
This, I only answer my landline if I'm expecting a call on that number. Unknown calls on my cellphone, I don't answer. If they call twice in a row then I'll answer, since its most likely something important.