Security researcher Tom Eston has written a fabulous article on settings for a more secure iPhone or iPad. The key to the passcode is to ensure its complex and greater than 4 characters or digits. Erase data function will erase all data after 10 failed passcode attempts. Find My iPhone/iPad is a very important feature to enable. Backup Encryption ensures that the backup of your device is encrypted. Don’t Jailbreak your device! Jailbreaking makes many of the built in security features useless and allows your device an easy target for data theft.”]
Source: https://www.csoonline.com/article/2134942/useful-settings-alert–how-to-secure-iphones–ipads.html