How to update my iPhone 6 to the latest iOS?
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[Re-Titled by Moderator]
iPhone 6, iOS 12
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Hello,
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 your iPhone or iPad wirelessly --> Update your iPhone or iPad - Apple Support
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 install a higher version. For an iPhone 6 that is iOS 12.5.7. Apple indicates ( Unable to update my iPhone 6 Plus from 12… - Apple Community ) I need to point out the obvious and state that if you want to run a higher system version than your current device will run, that you need to buy a newer device.