You can update your mobile phone's software when a new software version is available. It's recommended that you back up the phone memory first. First you need to install iTunes on your computer. You can download the program from www.itunes.com
Connect your mobile phone to the computer
Connect the data cable to the phone socket and to your computer's USB port.
Start the program iTunes on your computer.
Update the phone software
Depending on your settings in iTunes, the program may suggest to update your mobile phone automatically.
To start the update manually:
Click your mobile phone in the menu to the left.
Click Check for Update.
Follow the instructions on the screen to update the phone software.