According to Wikipedia, Samsung Galaxy S2 is an Android smartphone which was announced by Samsung on Februray 13, 2011 at the Mobile World Congress. It was given worldwide release dates starting from May 2011 by more than 140 countries in some 120 countries.
It is the successor to the Samsung Galaxy S that features Android 2.3.3 (Gingerbread), a 1.2 GHz dual-core SoC processor, in either Samsung’s own Exynos SoC (GT-i9100 model) or Nvidia’s Tegra 2 SoC (GT-i9103 model) and a 2 Mpx rear camera for video chatting, video recording, and stills.

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