We use voip.ms. I bought a nice refurbished Cisco phone for the house; their website had step by step instructions. As a plus, I have one of those auto-attendants for people who call in. They can press and get the home phone to ring, or ring my cell or my husbands cell or even my office. There’s a hidden menu that lets me use the number for conference calls (which has been handy more than once). I had someone on Fiverr record the greeting and menu.