Read review here.

 

http://www.engadget.com/2011/10/11/t-mobile-samsung-galaxy-s-ii-review/

A Galaxy S phone can't get by on looks alone, and the GS IIs have all been performers. With its 1.5GHz processor, a step up from the other phones' 1.2GHz chips, this should be the quickest of the bunch, right? Not so fast, dear reader. Those phones used Samsung's dual-core Exynos, while the T-Mobile flavor is instead using the dual-core Snapdragon APQ8060. While that isn't exactly like comparing apples to oranges, these two bits of silicon definitely wouldn't be found in the same section of the produce aisle.

There are many cases where this phone proves slower than its siblings, including a Quadrant score of 2,576 (the Epic 4G nabbed 3,244), Linpack single / multi scores of 42 / 70 MFLOPS, respectively (compared to 55.1 and 79.5) and Neocore hovering at around 57fps (compared to 59.8).

So, T-Mo got the gimped device, then? Oh no, it's never that simple. The SunSpider 0.9.1 JavaScript benchmark, which gives a good impression of how quickly a modern webpage will load and respond, delivered an astonishing 2,407ms. That's a full 1,000ms lower than the previous versions managed and a new Engadget world record.

Of course, none of this matters worth a damn in the real world; it's all about how the phone performs and feels in the hand, and when cradled thusly the GS II won't disappoint. It boots in a respectable 28 seconds and, once there, is very responsive to your every gesture. Webpages load quickly, apps launch promptly and suffice to say this isn't a device that will leave you wanting.

Battery life doesn't disappoint, even though this model doesn't match the heights of the AT&T model, which scored 9.5 hours on the battery rundown test. The Sprint version struggled to keep a video looping for 8.5 hours, while this model made it 7.7 hours. That is, again, despite having the biggest battery of the three. We're not sure whether to blame T-Mo's antennas or the new processor, but still we don't think you'll upset with the longevity here. We found a day of solid usage to be well within the realm of possibility, more if you keep things light.

In terms of network performance this is a 42.2Mbps HSPA+ device and, while we weren't able to test in an area that has that kind of bandwidth available, we've seen results showing 20 - 25Mbps down and 2 - 3Mbps up. Obviously your mileage here will vary considerably depending on network strength, and our own tests in an area T-Mo's coverage map lists as "4G Good" were admittedly less stellar, but still quite good: averaging 9.5Mbps down and 1.8 up. Pings of 700 - 800ms, however, mean you won't want to pipe your COD server through this connection.