Buying a new phone

The Apple Limited Warranty

covers your iPhone and Apple-branded accessories against manufacturing

defects for one year from the date you bought your product. The Apple

Limited Warranty is in addition to rights provided by consumer law.

Our warranty doesn't cover damage caused by accidents or unauthorized

modifications. See the warranty for complete details. You can check

your warranty status online and update your proof-of-purchase

information if there's an error in our records. If our warranty, your

AppleCare plan, or consumer law don't cover your repair, you'll pay

out-of-warranty fees.

But you can buy extended warranty called AppleCare+

https://support.apple.com/iphone/repair/service

Apple’s default warranty on every product they make and sell is one year. You can add AppleCare+ within 60 days of purchase to gain one additional year of coverage (so 2 years total coverage with AppleCare+).