The information that you carry on your iPhone and or iPad can be protected by turning on the Passcode Lock.
This can be found by:
- Going to Settings on your device
- Then go to the General tab
- Then go to Password Lock
Here is where you turn the Passcode on and you can select a simple 4 digit passcode or if you turn that off you can enter a longer passcode.
There is also the Erase Data tab whereby 10 failed attempts at entering a Passcode will wipe and erase all data from the iPhone or iPad