Formatting an iPhone 3G will erase all the data on your phone, delete all your apps and reset your phone to factory settings. Formatting your phone is a good last resort if you're having software issues with your phone. Keep in mind that the format is permanent and any data irrecoverable.
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Click the "Settings" icon.
Scroll to the bottom and select "Reset."
Select "Erase All Content and Settings." A warning message will display. Confirm your selection. The iPhone screen will turn off then show a "waiting" sign. After formatting is complete, the Apple logo will display and finally your formatted iPhone will reboot.
Tips and warnings
- Deleted data can't be recovered. Back up all your contacts and any data you want before formatting your iPhone.