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I have a family plan through AT&T. I want to get two iphone 5s's tommorrow using my 2 eligible upgrades. I'm actually going to sell the new iphone 5ss and my sisters' (who's lines on my plan are the ones that are up for upgrade) will continue to use their current iphone 5 and Galaxy S4s,

Unfortunately, my sister's can't come with me tommorrow. I assume their phones are going to go dead when I buy the new iphones.

1. How can I get my sister's phones reactivated if I don't have their simcards with me tommorrow?

2. Do they have to do something to be able to use their old phones again?

3. I assume I can't sell the new iphones until they get their phones reactivated, is that right or wrong? I'd like to sell asap of course.

4. Would I make more money on the phones if I unlock them and if so, how would I do that?

5. When I sell the new iphones, do I just not send the new buyer the simcards in order to keep them from using my plan?

Probably dumb questions but I'm new at this. Family short on money right now so need to sell.

Thanks.