My mom is in a new-ish condo that has 1 wall jack in which her internet is connected to (modem I suppose). She is elderly and having severe health situations and isn't great about having cellphone handy and charged. I want to plug in a landline but there are no other phone jacks, just the internet jack in the 2nd bedroom. Can I hook up a phone through that? Do I need a jack plug in with a dual slot or something or can I connect phone right to the modem/computer? Not my forte so thanks for any advice. Then we can also continue this thread to discuss care of aging parents. It's been a hellacious year for me in this regard.