Passcode recovery

If you forgot your passcode, you can use your Apple ID and password to erase and reset your device without a computer.

Apple support have an article online to help guide you:

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

Pamela1040 Said:

"Passcode recovery: I forgot the passcode to unlock my iPhone"

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Recovering a Passcode:

Look in a location you would had stored it in, such as on a looseleaf sheet of paper. Learn from this, knowing to always keep a backup record of all of your:

• passwords
• passcodes
• PINs.