iOS16 will only be available on iPhone 8 and newer.
List of device supported iOS 16 :
- iPhone 8 and 8 Plus
- iPhone X
- iPhone XS & XS Max
- iPhone XR
- iPhone 11 Series
- iPhone SE Gen 2
- iPhone 12 Series
- iPhone 13 Series
- iPhone SE Gen 3
Source
List of device supported iOS 16 :
- iPhone 8 and 8 Plus
- iPhone X
- iPhone XS & XS Max
- iPhone XR
- iPhone 11 Series
- iPhone SE Gen 2
- iPhone 12 Series
- iPhone 13 Series
- iPhone SE Gen 3
Source