The AT&T version of the Lumia 920 and Lumia 820 received the Windows Phone 'Portico' update back in December, along with the HTC 8X. The same update has now started rolling out to the international version of the Nokia handsets.
The Portico update brings with it some much needed improvements to the performance of these devices. Nokia has improved the camera performance with this update, reducing the blur in some of the daylight images. Along with that this update also brings with it the ability to keep the device connected to the Wi-Fi even when the screen switches off, ability to reject calls with an SMS and Select All and drafts functionality for SMS.
The update is now slowly rolling out internationally and is expected to be completed by mid-March.