The Galaxy S III - Samsung's flagship smartphone for 2012 - hits U.S. shelves in the coming weeks. Now that Samsung is the world's largest maker of phones, the GS3 is one of the most important phones this year. In the hyper-competitive phone market, Samsung needs the GS3 to fend off devices such as HTC's One series, and Apple's iconic iPhone line. Can the Galaxy S III do that? The GS3 is so packed with features, even advanced users will have a hard time putting them all to use. If you want to carry one of the most advanced smartphones available, the Samsung Galaxy S III fits the bill.