Erase & Wipe Personal Data on Your Old iPhone 4 Completely Before Selling

When you are going to resell your old iPhone 4, don't leave your personal information vulnerable to identify by others. With SafeEraser, you can completely delete all data on your iPhone 4 and keep them safely before selling.

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iPhone "Restore" does not delete personal data! - [You must be registered and logged in to see this link.]

SafeEraser - iPhone Data Eraser, Wipe Remotely, Delete Data Before Selling
> Permanently erase content from your iPhone 5S/5C/5/4S/4
> Works with all iOS Devices - Jailbroken iPhone friendly and also compatible with carrier-locked iPhone

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Well, if you got the right hardware/software, you can erase just about anything from any computer/device. The only surefire way to prevent such is to toss your phone into a blast furnace. However, the right equipment to [You must be registered and logged in to see this link.] is not so easy, and generally not available to most users.
If you go to Settings>General>Reset>Erase all content and settings
Once you do that it will put the phone into setup mode with [You must be registered and logged in to see this link.] and everything will be delete from the phone and they won't be able to get your information back.