Received several calls from: 415-738-7504, listed on the caller id box as 'unavailable'. About this same time, a hacker messed up our computer. After our computer messed up, I caught the number ringing in and answered. No said anything, and after a few moments the line disconnected (hung up). A bit later, I called the number and got a voice mail. Since then they haven't called back. Think we caught them in mid process of messing with our computer. Reported them to the FBI. If you get a call from this number, go to:
www.fbi.gov and report them.