My phone can’t download the iOS new version

iOS 16 is the new version. Is that what you meant to write?

Older iPhones cannot run the latest iOS versions. To run iOS 16, your phone must be one of these models:

If you really mean iOS 14, this Apple support article shows the devices which support it:

iOS 14 and iPadOS are compatible with these devices - Apple Support

i want to download IOS 14