Since 2010, the tech we buy—and why we buy it—has changed dramatically. Stores that used to dedicate shelf space to music players, printers, and desktop computers have had to make room for wearables, smart home devices, and, of course, smartphones.

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In just ten years, smartphone technologies have made an incredible leap forward—and consumers are, clearly, responding. When it first hit stores in 2010, Apple's iPhone 4 was widely regarded as a must-have for any smartphone buyer. It set new

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