You can set your phone to update apps automatically so you always have the newest versions installed.
To turn off automatic update of apps, press Do not auto-update apps..
To turn on automatic update of apps using mobile network, press Auto-update apps at any time. Data charges may apply..
If you turn on automatic update of apps via mobile network, your apps are automatically updated via the mobile network when no Wi-Fi networks are within range.
To turn on automatic update of apps using Wi-Fi, press Auto-update apps over Wi-Fi only..