Lucking Out - Evo 4g for 50 $$$ no contract!

[conkid]

So I came home this weekend and found out my sister had done a 2 year upgrade and bought a touch pro 2. I also have a touch pro 2. I told her she was a fool because the evo was coming out Friday! I had planned on selling my TP2 and upgrading (have been out of contract for 4 years).

So she was within her 30 days and we took her TP2 back to the sprint store today. She finds out they had effed everything up and wouldn't have gotten her mail in because the dude at the sprint store let her upgrade one day early. It was lulzworthy but she left with her 329$ credited back to her account.

I say i'll sell you my TP2 for 150 bucks if you want a keyboard that bad. She agrees, and also says she will go pick up an evo get it activated on her account then give it to me to activate the ESN on my account and swap her for my TP2. Meaning I won't have to use my upgrade or resign my contract

Questions:

Will I be able to activate that esn online or will I get any grief from sprint - I know they will have to add the additional 10 dollar fee on to my account and subsequently remove it from my sisters. (she's premiere so she gets an annual upgrade).

Will I have to go to the store to have this done to make adjustments to my account?

Comments:

Would I be better off just signing a 2 year deal bcuz - I checked out one of the new flyers while in the sprint store and it appeared to say if you signed up for a 4g plan for 2 years you could do it for "59.99" ... wondering if its a two year lock in deal then that would potentially wave the 10 dollar fee?

I don't know all things to think about as Friday approaches... Woop!