Change Name on Expired Family Plan

Hi All,
Hoping to get some advice on what the best deal would be. I am currently part of a family plan that is now month to month due to the contract expiring. What I want to do is put the account in my name (it is currently in my sister's).

I've read there is a "Transfer of Service" option, but it comes with an $18 fee per line and an 11 month contract. I am okay with signing a new contract. Is there some way I could sign up for a new account and we'd be able to keep the same numbers without having to pay that transfer fee? And under a family plan with 4 lines, would I have to pay that fee for all 4 lines or could I only transfer the main line into my name? Thanks in advance!

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See this: Answer Center | AT&T, formerly Cingular
and this: Answer Center | AT&T, formerly Cingular

Edit: Cell Phone Forums Lied about letting members post links in forums so Im retracting all my post.