Broken screen

Standard Apple Warranty does not cover broken screens. That is accidental damage.

Depending on which model iPhone you own, see the prices in this link for screen replacement --> iPhone Screen Repair & Replacement - Official Apple Support

Do not let anyone other than Apple or an Apple Authorized Server Provider replace the screen on your iPhone.

What do you mean if you pay for the screen, they can give you another iPhone? Apple stores can replace a screen same day.