A:AnswerOnly the unit with the answering machine and corded phone plugs into phone jack. The cordless units have a small base that only needs to plug into a wall outlet, no phone jack.
A:AnswerI know that you can manually enter a phone number to block. So you don't need caller ID to set up. There is also a button to push to select calls to block as they come in that would require caller ID to set up. I don't know though if phones can block without caller id. Even though your phone isn't displaying numbers, I think the phone company would still have them and your phone would block. But I don't know for sure. That might be something your phone company could tell you. Or try it out and return if it doesn't work.
A:AnswerIt mounts flush to wall and is included. (It's that mount you see on it when they show sitting on desk. It pops off there and pops into another spot for perfect wall mounting) see photo attached
A:AnswerNo it doesn't block any calls from people, you want to talk too. If you put these numbers in the call directory. It does have a call blocker button you can push.
