The day may come that you are going to give away or sell your iPhone 3G, but you don't want the recipient to access any of your personal information. Apple provides an easy way to delete everything from your iPhone and restore it to factory settings.
Instructions
1. Back up the iPhone in iTunes before proceeding.
2. Find the "Settings" icon on your iPhone screen. The icon contains an image of gears. Tap the "Settings" icon.
3. Tap the line that says "General." It also has the gear icon.
4. Scroll down the screen until you see a line that says "Reset." Tap "Reset."
5. View the options on the screen, which include resets for settings, home screen, keyboard dictionary, network settings and location warning. To erase all data, select the line that says "Erase All Content and Settings." When you select it, a box pops up with a red button that says "Erase iPhone." Touch the red button and your iPhone erases all data on the phone.
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