Adding a new line on Verizon's share everything plan?

I want to get the iPhone 5 when it comes out and my options are AT&T's new mobile share plan or Verizon's share everything plan. I'm leaning towards the latter, but have a question: I spoke to a customer service rep who told me I could add a line unto my plan at any time, but what happens to this line? To be more specific, my brother is thinking of joining my plan when he gets back from serving our country over seas, two months after I start my plan. From what I understand, he would need to sign up for a two year contract, but since I signed up two months earlier, there would be a two month hang over after my two years were up and his were not. What happens then? He just goes an extra two months? Has anyone tried this yet?

Please lmk, and thank you in advance!

You are correct, he will stay on two months after you. But when you add his line you guys can tweak your plan to accommodate your data and talk needs

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