How can I upgrade my iPhone 6 to the latest software
How can I get upgraded to the latest software
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The title of your post says that you have an iPhone 6s. Your profile states that you have an iPhone 6 Plus running iOS version 12.x.x.
If you have an iPhone 6 Plus, then iOS version 12.x.x is the highest that you can go to. You would need a newer model iPhone to update to the current version, which is iOS 14.7.1
Axel F.