They keep calling my number, but never leave a message. I answered once but didn't say anything so I could hear them talk first, and they hung up. I also get the same kind of calls from different numbers from the same area. I think it is a debt collector because once a 415- number from the same area called and asked for the woman who used to have my phone number before me and it was a debt collector. I told them I'm not that woman and they said they'd remove me from the call list, but obviously they haven't and I get these hang-up calls that never leave any voice message.