Looks like that the second wave of Windows Phone 8 Portico update global roll-out has stared with carrier unlocked devices in Italy, Germany, UAE and Russia, along with UK’s Everything Everywhere (EE) network. The Portico update introduces a number of improvements, including SMS call reject, persistent Wi-Fi, Wi-Fi hotspot, addresses stability issues and more.

According to statement from Nokia Discussions forum the Portico global roll-out will continue in a phased manner over the coming weeks and is expected to be complete by mid-March. The Update brings the following enhancements to the Lumia 920 and Lumia 820:

• SMS create designs
• Select all the text (to delete it)
• Reject call with SMS
• New Wi-Fi settings (WLAN can be activated when the screen timeout)
• Correct the restart problem.
• Internet Explorer improvements
• Improving Bluetooth connectivity
• More efficient and reliable start-up sequence
• Enhancements in imaging performance
• Enhancements in battery management
• Additional platform updates and improvements

Here is how you can update your device:

• Make sure your battery is fully charged when you begin the update process
• You will have to be connected to Wi-Fi for the update to initiate
• The entire update process can take up to 30 minutes to complete

• If Wi-Fi is not on prior to checking for updates, select dismiss and turn on Wi-Fi.  (If Wi-F is on, this notice will not appear and the phone will begin downloading the update.)
• Phone will download updates and prepare to install.
• Update is ready to install. Select Install.
• Wait as the update installs.
• Update is all done. Select Done.
• Restart your phone.
• Check the OS version  8.0.10211.204

[Source 1, 2, 3]