How I start update my iPhone 6S
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What version of iOS is it running?...
Settings > General > About > iOS Version
iPhone 6s cannot be updated beyond iOS 15.8.2.
iOS 15 and iPadOS 15 are compatible with these devices - Apple Support
iOS 16 and iPadOS 16 are compatible with these devices - Apple Support
...Found by searching Apple's Knowledge Base.
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How I start update my iPhone 6S