If I have warranty do I get my screen replaced for free?

Hi, it depends on what happened to the screen of your phone. The technician will need to diagnose your phone & provide you all options. Any form of accidental damage is not covered under the limited warranty.

You can take your phone to an Apple Store or Apple Authorized Service Provider. Book an appointment on getsupport.apple.com or use the Apple Support app.

Depends.

If you broke or damaged the screen, no.

If it is determined that the screen failed due to a manufacturing defect, it's covered.