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A: How to Erase and Factory Reset an iPhone 4S / 4 / 3GS / 3G - How to Use My iPhone Tutorial 3 - YouTube
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How to Securely Erase Your iPhone When Selling, Trading, Returning, or Giving It Away « iOS & iPhone :: Gadget Hacks
Before I sell my iPhone and delete everything, can the buyer possibly recover my data like a computer hard drive? - Quora
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