Apple Watch Series 3 has arrived, and it could be the model that finally pushes Apple’s wearable into the mainstream. After several software revisions, Apple Watch has evolved into one of Apple’s major project categories, and a constant cycle of new features and bands keep it feeling fresh and fashionable. Series 3 brings it all together, with health, fitness, and Siri enhancements, and, of course, iPhone independence with LTE. 

But after three generations, you might still be asking: What can I really do with it? The answer might surprise you. Find out and more in this ultimate guide to Apple Watch.

Editor's note: Updated Dec. 5, 2017 with information about Apple Pay Cash, new bands, and trade-ins.

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