Apple Hub on X: "According to iPhoneSoft, iOS 15 will be compatible with all iOS 14 compatible devices except for the iPhone 6s, iPhone 6s Plus and the 1st gen iPhone SE
Apple's iOS 14 again rumored to support all devices compatible with iOS 13 | AppleInsider
Developers can now submit iOS 14 compatible apps to the App Store - 9to5Mac
iOS 14 compatibility: Find out if the new operating system will work on your iPhone
ios 17 is compatible to iphone 11 - Apple Community