My phone is Unavailable cause i forgot the passcode,how could i unblocked my phone with out passcode?

(< iOS 15.2) See this Apple article: If you forgot your iPhone passcode

If you forgot your iPhone passcode - Apple Support

(iOS 15.2 and newer) 

How to remove your iPhone, iPad, or iPod touch passcode without a computer

How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

If the problem persists, visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem. And they could offer a possible solution.

You will first have to make an appointment due to the pandemic.

See: Contact Apple for support and service

Contact Apple for support and service - Apple Support

See if anything here helps.

iPhone won't turn on or is frozen.  *

ASC YouTube for how to restart your iPhone if it’s frozen on the Apple logo