Duo is a unique cellular phone that supports both GSM and CDMA technology simultaneously. The Samsung Duo phone allows users to use two GSM or two CDMA or one of each sim cards at the same time. The release of Samsung Duo is because of increasing demand of dual Sim-cards cellular phone in Asia beginning year 2007.
Other features and specifications of the Samsung Duo includes 2.2-inch touch screen that supports handwriting recognition, 1.3-MegaPixel digital camera, MP3 player, and microSD expansion slot. Besides that, the Duo phone is also a good business phone as it supports document files in excel, word and PDF formats.
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