iPhone 11 is waterproof?
iphone 11 is waterproof
I can use iPhone in heavy rain?
iPhone 11, iOS 15
No iPhone is waterproof; they are water resistant.
See the following from iPhone 11 - Technical Specifications - Apple
iPhone 11 is splash, water, and dust resistant and was tested under controlled laboratory conditions with a rating of IP68 under IEC standard 60529 (maximum depth of 2 meters up to 30 minutes). Splash, water, and dust resistance are not permanent conditions. Resistance might decrease as a result of normal wear. Do not attempt to charge a wet iPhone; refer to the user guide for cleaning and drying instructions. Liquid damage not covered under warranty.
Personally, I would avoid using mine in heavy rain.