I moved to Charter tlephone service and so far it is good. The only thing if there is a black out, I need to have a UPS to power the phone thingy to keep service during the black out. Also the call waiting tone sounds different, more like a screech than a blip. Other than that, quality of service, up time, etc. is totlly worth the lower costs. I also have long distance included in my flat fee, so it makes it great since my roommate and I can talk all we want and never have to deal with the bill and who called what game. My answering machine, fax machine, and all my regular phone work just as well when I had a traditional line.
And I think I was offered a chance to keep my current number, but you have to pay the "trasnfer" fee, which I opted not to.