Ok.
We have internet and mobile phones with separate companies. When we moved last time, we could only get wireless broadband internet from Telstra (the only thing anyone else could offer was dial-up ... there was no adsl on our side of the street )
We had that problem too, but the big indignity was the Telstra wireless broadband came on a really long contract, and you have to keep paying it or pay off the balance even if you never use it. We didn't think we'd move so soon, but we did.

Long contracts are evil. And Telstra love their long contracts. Whatever you do, don't sign up for anything that has a 12 or 24 or God forbid a 36 month contract when you move out of home.