Warning by CNET: iPhone "Restore" does not delete personal data!
Before selling your iPhone 5, sending to Apple, or otherwise sharing it, note the following: performing a "Restore" operation on the iPhone 5 does not delete personal data from the device. In fact, mail, contacts, and various other data remain intact on the device after a restore, then you should eraser all the data for iPhone 5.
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File Types Supported to Erase on iPhone 5:
Contact, Message, Call History, Calendar, Email, Note, Reminder, iTunes DB, App (and generated data), System setting, Apple ID, Photo, Video, Voice memo, Keyboard Cache, Safari Bookmark, Passbook, and more
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