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 two fingers downwards starting from the top the screen.
Tap the settings icon.
Tap About phone.
Tap System updates. If a new software version is available, it's displayed.
Follow the instructions on the screen to update the software on your mobile phone.