Tap to launch the Settings app from your Springboard.
Choose Touch ID & Passcode from your Settings menu. If you've already set a passcode you may be asked to input your current PIN.
Toggle the Simple Passcode switch to the OFF position.
If you previously had a passcode set, you will be prompted to enter your old PIN before changing your passcode.
If you didn't have a previous passcode set, tap the Turn Passcode On button.
Enter your new complex passcode. Using a combination of letters, numbers, and symbols is recommended. Tap the Next button to continue.
Re-enter the passcode to confirm, then tap the Done button.
You'll now notice a new Passcode screen appear with a full keyboard when unlocking your device.
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