Rolling out a massive update like Android 4.1.2 Jelly Bean for a hugely successful device like Samsung’s Galaxy S2 is no picnic. And due to the GS2 having been sold in so many slightly different variations across the world, it takes time. A lot of time, actually.

Fortunately, Sammy seems to be moving pretty fast with S2’s JB updates. We’re hearing that T-Mobile’s version of the Galaxy S2 is the latest guest to the Android 4.1 party, following the GT-I9100P, the Indian S2 and Vodafone and Three UK’s versions, all updated in the past month or so.

T-Mobile’s Galaxy S2 carries the SGH-T989 model number. Unlike the “international” variant, it packs a 1.5 GHz dual-core Qualcomm Snapdragon S3 CPU. The processor is paired with 1 GB of RAM, while the Super AMOLED Plus screen is a 4.52-incher with an 800 x 480 pixels resolution.

First released with on-board Android 2.3 Gingerbread, the SGH-T989 has received its first major software update – 4.0 Ice Cream Sandwich – back in June 2012. While important, that particular update hasn’t revamped the phone’s user interface to the Nature UI, found on the Galaxy S3.

That means you’ll now get a drastic Nature-inspired makeover that will make the Galaxy S2’s user interface look very similar to the one on the GS3 or Note 2. Need extra reasons to be psyched about the upgrade? How about Project Butter performance enhancements? Or Google Now integration? Or Direct Call, Smart Stay and Pop-up Play?

I’m sure that you’re all eager to update, but be patient if the upgrade isn’t yet live. These things usually roll out in phases, so you might have to wait an additional day, two or, worst case scenario, a week.

You can get Jelly Bean both over-the-air and via Samsung’s KIES. You’ll want to back up your data beforehand, have a strong Wi-Fi connection, and at least half a charge available. Ready, set, go!

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