Engadget's smartphone buyer's guide: summer 2012 edition

Despite the sweltering heat waves, our spirits are high at Engadget, and for good reason: it's time for our summer edition of the smartphone buyer's guide. Here, you'll find our top recommendations for the best smartphones across several US carriers, along with the best QWERTY and budget alternatives. In many ways, it's now easier than ever to find a world-class smartphone, but unless you've...