Samsung has started rolling out the Ice Cream Sandwich update for their Galaxy S II smartphone, which will take your phone from Android 4.0.3 to Android 4.0.4. The previous update rolled out by Samsung upgraded your phone from Android 2.3.x to Android 4.0.3, but the latest update will upgrade your phone to Android 4.0.4 bringing along performance and stability, and some other fixes that will improve your daily experience.
The update is released for the network unlocked or sim-free Galaxy SII and is made available for Russia first. It will be subsequently available to other markets soon. The update is available over-the-air and also via Samsung Kies.
Connect your phone to a PC and use Samsung Kies to get the update, or you can also check manually for over-the-air update by going into Settings > About Phone > Software updates.