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The iPhone 4S is the follow-up to the very popular iPhone 4 and features a faster Apple A5 dual-core processor and improved 8 megapixel camera. The iPhone 4S also features Siri – a voice assistant heeding natural-language questions and commands, and taking dictation. Other features of this smartphone include a gorgeous 3.5-inch high-resolution display, full web browser, Bluetooth compatibility, music player, WiFi. The iPhone 4S also comes equipped with quadband GSM, CDMA, and WCDMA modes for international use.