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

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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

Yes

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

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

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.