Whenever an operating system evolves and grows with new features, free updates will become available (why, after all, should you pay when it is the responsibility of the system manufacturer to stay cutting edge?).
While in the Settings app, tap on the ‘About device’ option listed under System to get various bits of information on your device. Here you will see an option called ‘System updates’ – tap on this and any available updates will be presented, whereby you can opt to restart the device and install them. This process may take a bit of time, so make sure your device is connected to a charger and that you don’t intent to use it for a few minutes. System software updates may also be flagged up in your notifications pane (swipe down from the top of the screen), so check that regularly for