Last week, Samsung has released an Ice Cream Sandwich upgrade for Galaxy S II. If you have not upgraded the device yet and want to know more, then have a look over the PDF document created by CoolSmartphone by converting the PowerPoint slides prepared by Samsung which highlights all the changes.
This guide will advice you in obtaining an upgrade for your Galaxy S II ( GT-I9100 ) smartphone and the observations regarding the update. It also suggests some of the key differences between Gingerbread OS and Ice Cream Sandwich OS.
Check-out the PDF link here. You can read, download or save the guide for future references.