failure in drop test
i bought iphone 15 on last month and its dropped by my hand in my room its self been like 5inch and the screen was ditched
iPhone 14 Pro, iOS 17
Accidental damage is not covered by iPhone Warranty. If the screen broke during a fall (It is glass afterall), you'll have to pay for screen to be replaced. If you wisely bought an AppleCare+ Plan when you bought your phone, the cost will be minimal. If you didn't, the cost is much higher.
See about iPhone Screen Replacement here --> iPhone Screen Repair - Apple Support