Select an alphanumeric code for your iPhone PIN

Many people set a four- or six-digit numeric PIN for their iPhones, but you can add another layer of security. If your passcode contains letters, numbers and symbols, it will be much more difficult for someone to guess. To upgrade your passcode:

• Go to Settings > Touch ID & Passcode > Change Passcode > Passcode Options.
• Select Custom Alphanumeric Code.
• Enter your new passcode.