Who called from 4153636650

I received several phone calls from this number. On the caller ID it showed up as security HM WCS. Since I didn't answer their calls, they didn't bother to leave a msg. It is really annoying. I wished something could be done

Call Received: 10:11 AM EST, Thursday 26 August 2010
Caller ID: 415-363-6650
Missed Calls List: San Francisco / North Bay Area
Response: Picked up because I am expecting a call that might contain a job offer. 10 seconds of silence. Announced I won a free home security system. Pressed 3 to remove myself from their call list. Let's see if they call me again.
Previous Calls: Received call from 415-363-6631 on Friday, 20 August 2010.

Yes, I'm having the same problem as everyone above! This a a cell phone that I pay as I go and only use in emergency....It is becoming a daily habit of them calling.I'm going to have to put my cell phone on a do not call list......

i've answered calls from this number 3 separate times now and "pushed 3" to be removed... calls still continue

I ignore all numbers that aren't in my address book. This number just called and did not leave a voice mail.