Security when selling an iPhone

Hi,
I am selling my iPhone 4. What should I do before selling my iphone, what information all needs to be cleared? I'm aware there is a Factory Reset I can do, but will that keep all my information is secure and history secure? I've made purchases online and have a lot of information in there currently. And I'm not sure what the hackers of the world are capable of doing!
Thanks!

Erase all contents and setting. This is covered in the manual

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Yes. Send the person you bought it from this link and tell them to follow its instructions.
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Follow the instructions in this article:
http://support.apple.com/kb/HT5661
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Hello Sid Underwood,
Thank you for using Apple Support Communities.
For more information, take a look at:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694#4
Configure your security software
Related errors: 2, 4, 6, 9, 1000, 1611, 9006, 9807, 9844. Sometimes as a result of this issue, a device might stop responding during the restore process.
Check your security software and settings, which can block ports and prevent connection to Apple servers during update and restore.
Have a nice day,
Mario

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Security when selling an iPhone

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