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AT&T has announced its Samsung Infuse 4G smartphone (mode number SGH-i997). It is the first 4G smartphone from at&t comes from Samsung, not from HTC. The new Samsung Infuse 4G smartphone comes with 4.5 inch Super AMOLED display which is at present the largest screen among the other 4G smartphones such as Motorola Droid X and HTC Evo 4G.