Unlock old iPhone that is locked with iPhone unavailable
How to unlock my old iPhone that is locked with iPhone unavailable on the screen
iPhone 8 Plus, iOS 15
How to unlock my old iPhone that is locked with iPhone unavailable on the screen
iPhone 8 Plus, iOS 15
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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In order to re-enable your iPhone, you will need to reset it. Because it is an older iPhone , you will need to do this via a computer or mac. See this link for further instructions on how to do that
If you forgot your iPhone passcode - Apple Support
Good luck!
How if any way can I get my iPhone unlocked without a computer if the screen shows iPhone unavailable
If there's an Erase option, use that. Otherwise, no.
WheelieNick: I already posted that suggestion and link.
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Unlock old iPhone that is locked with iPhone unavailable