Hi Becky, The only number shown for simultaneous ring is the nomorobo number. When trying to add my number it says: Home phone will ring for incoming calls by default, only additional numbers can be set up for Simultaneous Ring. BUT - my number is now shown as protected by nomorobo and it seems to work. I think I may have received the one signal and then the fax tone only after doing my first test call to my home number from my cell phone after having made the nomorobo set up test call. Maybe it needed some time to take affect. I'll leave nomorobo on and monitor my voice mail for a while. I'll get back to you if voice mail gives up on me again. Thanks for your support!