Look, just get the thing. It only cost $40. You use it and try it. You find out it is reliable. You disconnect your land line at home and save $35 a month.
You have more than enough people on here to tell you it works that the $40 is not really a risk. Besides, you can return it if you don’t like.
Do yourselve a favor and trust the people on FR. They will rarely if ever steer you wrong. The dang thing works. It is my home phone replacing my land line. Its better than the land line was. very satisfied