People would create passcode to protect privacy of iPhone or iPad. But in some cases you may forget the iOS screen passcode.
Device is disabled
When you or someone else has entered the wrong passcode for many times, the “iPhone is disabled” message will pop up on your screen.
Get a used Phone
You bought a used iPhone or iPad but you couldn’t bypass the locked screen.
Change passcode by error
Your friend or someone else played a prank and reset your screen passcode, but failed to mark it down so you couldn’t access your phone.
iPhone screen is broken
You dropped your phone and the front screen shattered. It is very urgent for you to access your iPhone or iPad.