Switching from Evo 4G to iPhone 4S on Sprint?

So, right now I'm planning on replacing my EVO on Sprint with an iPhone I'm buying from ebay, I'm one year into a two year contract. I'm wondering if there are any charges Sprint requires and if they'll charge me to remove the 4G addition from my plan

They won't charge you anything additional, but the $10 premium data charge will still be applied when you switch phones because it is required on the iPhone as well. Make sure you get a Sprint iPhone Because you will not be able to activate a verizon or At&t one on your plan. Also if you but a phone that has been reported lost or stolen you will not be able to activate it because the ESN will have been flagged.

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