Securing iPads and iPhones
UT Tyler Office of Information Security
Listed below are links to the Apple support sites listing steps you need to perform to protect the data that resides on your iPad or iPhone.
How to update to the latest version
How to backup your device
Require a passcode, or change passcode settings
Safari security settings:
Set up Find My iPhone, iPad, Apple Watch, and Mac
Erase All Data Before Return, Repair or Recycle
You must turn off Find My iPhone Activation Lock before erasing.
In order to prevent an unauthorized user from being able to recover sensitive information from the device, the disk should be overwritten via the "Erase All Content and Settings" setting before it is out of the user's physical control.