I know it seems wierd. I have bt openworld broadband now, and the transition was easy, because It was before yahoo. The short answer is NO, you don't have to sign up to BT Yahoo, but soon it will only be BT Yahoo, and that doesn't mean broadband! you can keep your own connection deal (ie: anytime) but you'll still have to be with BT Yahoo. Best idea is go to the BT Openworld home page, and check the "help" links. They're usually pretty good. Hope this is of some help.