Just posted this in the iPhone forum, but it looks like I should have posted it here, so here goes:
On my plan, I am available for an upgrade on my 3GS. My daughter is not yet eligible on her plan, which I pay for as one of the phones on our overall plan.
Is it possible for me to get the upgraded phone on my plan and give her the 4S to use with her number, keeping my 3GS on my number? Then, later, use her plan to upgrade my phone when the iPhone 5 comes out?