iPhone
How can I update IOS 14 to IOS 16.4.1 on my phone
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There are different ways to ensure the highest iOS that your device will support is installed on your device.
This support article has instructions about updating an iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support Read the article for recommended criteria for being able to use wireless updating.
You can also use Mac and PC computers to update system software --> Update iOS on iPhone - Apple Support
When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date (and can't go any higher) and won't install anything. If you want to run a higher system version than your current device is capable of running, you need to buy a newer device.
Any equipment currently running iOS 12.5.7 can't be updated to anything higher.
An iPhone 5S, 6, or 6plus, will only update to iOS 12.5.7
An iPhone 6S through 7, or SE(gen. 1), will currently update to iOS 15.7.5
An iPhone 8 or later will directly update to the latest iOS, 16.4.1