How do I unlock my iPhone 13 Pro Max?

Which One?

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

If you forgot your iPhone passcode or your iPhone is disabled - Apple Support

If your phone is carrier locked - How to unlock your iPhone for use with a different carrier - Apple Support

How to unlock your iPhone for use with a different carrier - Apple Support

If your phone is Activation Locked - How to remove Activation Lock -

How to remove Activation Lock - Apple Support

There are different kinds of locks on an iPhone.

What does the message on the screen say?

Unavailable?

Security Locked?

Activation Lockes?

Something else?

Start here: How to Unlock an iPad or iPhone? - Apple Community

Please define "unlock".