This number 415-358-7620 calls my cell phone.

With caller ID I can see who I want to talk to.  Otherwise I just pick up the receiver and put it down again so there are very few rings to disturb my work.  I realize I'm dealing with a computer generated call and so who cares if there is someone "real" on the line.  All they want is a donation or to taunt you with "Don't tell me you don't want to make money", etc.  Boring and invasive but unless the government puts a stop to it, it'll go on and on. Let it go.  Life's too short.

I picked up the phone finally after ignoring the call for the last few days. A man asked to speak to the head of the household. When I asked who was calling, he said "a charity". Didn't tell me what charity though. I then hung the phone up.

Don't know who called

I didn't pick up and the caller hung up.