Please send iOS 16 update in iPhone 6s series

An iPhone 6S can only be updated to iOS 15.7.2, no further. It doesn't have the hardware needed to run anything higher. If you need to run a higher iOS. you will need to purchae a newer phone.

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.6

• If you have an iPhone 6S through 7, you can update to 15.7.2

• If you have an iPhone 8 or higher, you can update to 16.2

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support