iphone unavailable
how do i get back into my iphone
iPhone 12 Pro Max, iOS 15
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You will need to re-enable your phone
You can do that on different ways depending on your iOS version
If you're running iOS 15.2 or higher, you can do this process without a computer, see this link for further reference
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
If you're running an older version of iOS you will need a pc or Mac to re-enable your phone.
See this link for further reference
If you forgot your iPhone passcode - Apple Support (IS)