Even though you might think otherwise, not all Samsung Galaxy S II models are the same as the one coming to AT&T will feature a smaller 4.3 inch Super AMOLED Plus display as opposed to the 4.52 inch monsters that will appear on both the Sprint and T-Mobile variants. On the other hand, unlike the T-Mobile version, the AT&T model will have the Samsung Exynos 1.2GHz dual-core processor under the hood. That seems to be the popular choice amongst those who have been waiting for the smartphone to launch.
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source: AT&T via Phandroid