How can I update my iPhone 6s?
How can I update my iPhone
[Re-Titled by Moderator]
iPhone 6s, iOS 12
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Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.
The iPhone 6 can be updated to iOS 12.5.6.
The iPhone 6S can be updated to iOS 15.7.