I purchased an iphone 7plus years ago for my son he had had
I have a iphone 7plus and forgot my lock code and now it's saying iphone unavailable how do I factory reset my iphone
iPhone 7 Plus, iOS 15
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If your iPhone has iOS 15.2 or higher installed you can do this process without a computer
How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
If you have an older iOS then 15.2 there is no way to do this process without a computer or mac
If you forgot your iPhone passcode - Apple Support