Warning: iPhone "Restore" does not delete personal data! - From CNET. SafeEraser prevents identity theft when reselling iPad Air. All your personal data can be erased permanently and unrecoverable.
iPhone Data Eraser, Wipe iPhone Permanently, Delete Data Before Selling
> Permanently wipe all personal information from iPhone
> Works with all iOS devices - Jailbroken iPhone friendly and also compatible with carrier-locked iPhones