Can I update my iPhone 6s to iOS 16.6?

If you have a iPhone 6s, then the answer is no. The iPhone 6 S cannot be updated to iOS 16. Its hardware is not compatible. If you have a different iPhone, see the instructions here to update it yourself. No one can do it for you.

Update your iPhone or iPad - Apple Support

The iPhone 6 S cannot be updated to iOS 16. It's hardware is not compatible.

Yes

My iPhone is not update to 16 version . Please update my iphone

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iOS 16 and iPadOS are compatible with these devices

...Found by searching Apple's Knowledge Base.

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Unfortunately, that is not possible.

if is there any way to update please let me know

Please software update please iPhone 6s 16.6

Update iOS 16 iPhone 6

Did you bother to read any of the posts on this one page thread?

Since you clearly didn't, the answer is NO, NOT POSSIBLE.