What do I need to do to my iPhone 4S before I sell it?


I have an iPhone 4S.  When the next iPhone comes out, I intend to sell my 4S on eBay to help pay for the new phone.  My question is, do I need to do anything special to my phone besides wiping the data before I send it to the new owner?  Do I need to get it unlocked?  Do I keep my SIM card or do I just leave it in there?  Anything else I should know?


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