How to update my iPhone 6's iOS?
How can I update my iOS
[Edited by Moderator]
iPhone 6, iOS 12
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It appears that you have an iPhone 6 with iOS 12 installed. That is the highest iOS version, 12.x.x, that can be installed on that model iPhone. You will need a newer model iPhone to install iOS version(s) 15/16.
Axel F.