The annual Mobile World Congress trade show is less than a week away, which means we're about to be introduced to some of the most exciting new smartphones that will be released this year. Well, perhaps "introduced" isn't the best choice of words, since a long string of leaks has already revealed just about everything there is to know about the three biggest stars of the show. According to everything we've seen so far, Samsung's Galaxy S7 and Galaxy S7 edge are going to be sleek and speedy upgrades to last year's Galaxy S models, and the LG G5 is also set to be a major upgrade. But once all these new lightning-fast Android phones start hitting

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