Can I update my iPhone 6s?

Welcome to Apple Support Communities.

See: Update iOS on iPhone - Apple Support. Depending on the current version of iOS installed and the model of iPhone you have, you may or may not have an update available.

Jack

lawanda272 Said:

"can I get a update for iOS?"

-------

Perhaps.

Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Making Use of a Computer for Updating an iOS Device - User Tip