Do you know what does work?

I have an obi device which works with google voice. Since I got netfree we have been having all kinds of problems. I called customer service, made recordings.... it seems they can't fix it. I really need a reliable american line. That is what I was asking. If anyone has a US line that works smoothly with netfree and if so which provider

Does anyone have a DSL line that works with netfree? If so which one?

Thank you