Want to update my iPhone 6s

Update your iPhone, iPad, or iPod touch

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.7

• If you have an iPhone 6S through 7, or SE 1st generation, you can update to 15.7.8

• If you have an iPhone 8 or higher, or SE 2nd or 3rd generation,you can update to 16.6

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

I have given you full instructions on how to, go back and read my post.

I want to update my iPhone 6s version to15 os

korda272 wrote:

I want to update my iPhone 6s version to15 os

Read Kurtosis12's post from a couple of days ago.