Apple Watch 2 and iPhone 13 compatibility

Hi Groot_7,

Thanks for posting in Apple Support Communities.

We understand that you have questions about compatibility with the new iPhone 13 and Apple Watch series 2. iPhone 13 will run iOS 15. Your Apple Watch will need to run watchOS 8. watchOS 8 requires iPhone 6s or later with iOS 15 or later and one of the following Apple Watch models:

Apple Watch Series 3

Apple Watch Series 4

Apple Watch Series 5

Apple Watch SE

Apple Watch Series 6

Apple Watch Series 7

See more on Apple's website for WatchOS 8.

Your Apple Watch wouldn't be compatible to run watchOS 8 and pair with iPhone 13.

Regards.