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The update will begin rolling out to devices starting 11PM Eastern (8PM Pacific) and will offer all the latest features and improvements you can expect in the latest version of Android.
Remember that once you receive the notification your battery will need to have at least 50% of power on your Galaxy S II before you download the ICS update.
We will update this post with the ICS change-log when it is made available through Samsung or T-Mobile. Meanwhile be sure to share your update experiences with us
With the Samsung Galaxy S III for T-Mobile just around the corner, are you looking to upgrade? Or are you happy with your Galaxy S II? Let us know the comments section below.
source : T-Mobile