I basically can't get any calls and two calls to Comcast said it was not their problem, but I see from the communications on this site that it can be resolved through Comcast. After four rings, my phone states, 'The mailbox number you are trying to reach is not in service...goodbye.' I don't have Comcast voicemail. This is not an issue with my voice message machine as I have tried three separate machines now. I see that this issue has been resolved in the past. Will someone please help me?