iPhone 6s Plus
Updating phone software
It's recommended that you update your phone with the newest software, as the manufacturer continuously corrects errors. It's a good idea to back up the phone memory first. Before you can update the phone software, you need to set up your phone for internet.
Step 1 of 3
Press Settings.
Step 2 of 3
Press General.
Step 3 of 3
Press Software Update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.