Questions about ordering from apple website

This is for those of you ordering from apple.com.
Well, apple store is down again. What do you know.
Anyway, I was trying to pre-order earlier an iphone 4 and I had an issue. I am existing customer with AT&T and I am just trying to replace my phone with an iphone. I am on a family plan. However, on the cart, it says, 99.99 dollars for plan.
Why does it do this? Is apple going to try to mess up with my family plan? Please help. IF you are new customer, then it doesn't matter. But, for existing customers... I am not sure what is gogin on.
Also, I have an old iphone 2G and it does not let me change it to 30 dollars unlimited plan for some reason at apple.com or AT&T.com. I thought AT&T Said old 2G customers can have unlimited 30 dollars plan...
Obviously, they lied.