They did that with my landline. Our area went from one kind of internet line to another line on our service. This caused us to have to attach our phone to the modem (or whatever you call it). We had an emergency corded plug in the wall telephone that we kept in our bedroom for emergencies. The other phones are electric plug ins. We had a tornado hit about 3 miles from our house about 10 years ago and it took out a lot of the electric lines. Lucky for us, our old faithful corded phone worked where the other plug in phones didn't. Now I can no longer use that old phone. I wish I could, but that is the price for progress. I wish President Trump would fix that like he did the lightbulbs. Haha.