It's recommended you update your mobile phone with the latest 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 set up your mobile phone for internet.
Slide your finger downwards starting from the top of the screen.
Tap All settings.
Tap Update & security.
Tap Phone update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the software on your mobile phone.