Why does my phone say iPhone unavailable
Why does my phone say iPhone unavailable
iPhone SE
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Somebody entered the wrong passcode too many times
iPhone Disabled, Unavailable, Security Lockout,
You can sometimes remedy this without a computer if on iOS 15.2 or later by tapping on "erase iPhone" , but you will still need the Apple ID password. It will WIPE the phone, no choice!
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
video
ios 15.1 and earlier:
If you've forgotten your iPhone passcode – Apple Support (UK)
To prevent it opening in your pocket or purse and disabling the phone you can turn off Raise to Wake in Settings, Display & Brightness and turn off Tap to Wake in Settings, Accessibility, Touch