I have already found my phone please unlock him

"..... in the screen is unavalable...."

If the message on the screen says Unavailable, please follow the instructions in this Apple support document.

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

This is a user-to-user public forum.

This platform serves as a space for users to engage in meaningful conversations, share information, and exchange ideas related to Apple products. It's a community-driven initiative where users support each other by sharing their experiences and technical expertise in using Apple devices. While Apple Inc. is not actively participating in these discussions, the forum is a valuable resource for seeking guidance and assistance from fellow users who possess a wealth of experience with Apple products. Feel free to explore the discussions, ask questions, and benefit from the collective knowledge of this community.

Even if Apple Inc. were here they may not be able to help with the Activation Lock. Take your device to the nearest Apple Service center with proof of ownership and see if they can help.

This is a user-to-user forum. We cannot unlock your phone for you.

Mark a device as lost in Find My on iPhone - Apple Support

If it's your phone, you should already know how to unlock it. If it is asking for an Apple ID password, it's asking for your Apple ID password. If it is asking for a numeric passcode, it's asking for your regular one (or for one that you set up when marking it as Lost, if it did not have one before).