Deleting App Data

Hello Community,
I will sell my iPhone soon, so I want to be sure that no traces of my previous activities are left. Will deleting an app like Facebook or Gmail by clicking the "x" delete also all settings and login data? So if the guy reinstalls a certain app no traces of mine are left?
Also, if anyone has any suggestions what is the best way to delete my personal data, it would be highly appreciated.
Thank you.

Deleting an app with the "x" will remove the app and its data from the file system, but will not clear the data out of memory. So with commercial grade hacking tools (such as those available to law enforcement or advanced hackers) it would still be possible to find data remaining on the phone. If you don't think anyone will go to that much trouble it's good enough, but Erase all content and settings really DOES delete everything by erasing the encryption key and thus scrambling memory.

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