Unlock code not working in old phone
My daughter has broken her iPhone 12 so we put her sim in her old iPhone SE but can’t open it with her six digit code.
iPhone SE (2nd generation)
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If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -
Click on the link for instructions on how to reset your passcode without a computer if you have iOS 15.2 or higher.
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support
Click on the link for instructions on how to reset your passcode using a computer.
If you forgot your iPhone passcode - Apple Support If you forgot your iPhone passcode - Apple Support