Samsung’s Galaxy S2 has a 4.3 OLED screen and is run on the Android 2.3 operating system. It plays a ton of different audio files like AAC, MP3, WMA and WAV. Mulptiple video formats are also available. It comes in either 16 GB or 32 GB and is expandable with micro SD card up to 32 GBs. It is WiFi and Bluetooth ready and comes with a built-in GPS. The rear-facing camera is capable of 8 megapixel images.