Did not recognize number, let it go to voice mail but no message left on cell phone.
I never answer unknown callers unless a important message is left.
Don't have any further details about the caller or purpose.

Received a call from 415-363-5667 on May 24, 2011.  Did not leave a message.  Going to report it as a telemarketer.  My number is on the "Do not call list".

Read my comment above then this:

I decided to call the number and was immediately notified I had entered my number in their drawings.  I continued to listen to the many offers and declining.  Eventually I was asked if I wanted to withdrawl my  number, if so press 2.  I did and was advised I did not make the proper choice.  I listened and listened and again was told to press 2 if I wanted to withdrawl my number.  I was advised it was withdrawn.

It appears they  just like to drawl things out with  a voice telling you of all the things you can win.  The first time I pressed 2 I know I pressed 2.  I was told I pressed the wrong selection.  Another drawn out littany of prizes and was told to press 2 if I wanted to withdrawl my number.  I did and FINALLY WAS TOLD MY NUMBER WAS WITHDRAWN.

Sam