Sky TV/Broadband and Phone package?

Thinking about switching to this but can't find all the info I need. :(
To get this service I need to switch back to BT from Bulldog.

Here's some of the Q's I need answers to;
Can I switch my line rental and call charges back to BT and then almost straight away sign up with Sky, which would mean my call charges would be switched to Sky?

Can I sign up to Sky's Unlimited broadband as part of the package(can't find this info on their site)?

How much does it cost to add Sky Sports to the package(can't find this either!:angry:).

Hope you guys can help, it's driving me mad.:wacko: