How open my unavailable iphone

Click here and follow the instructions. Restoring the iPhone requires plugging it into a computer with iTunes installed, or a Mac running Catalina or newer.

If there's an option to erase it, you can use that instead.

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If you see the message that your iPhone is unavailable, then it must be restored to Factory Settings.

You can see how to do a Factory Restore without a computer here:

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

If you want to do a Factory Restore from a computer, see here:

If you forgot your iPhone passcode - Apple Support