Apple Watch Series 4 vs Series 3 and Series 2: what's different, anyway?

The Apple Watch was released to mixed reviews just a few years ago. Its future was uncertain, to say the least, and the uses for one were l...

The Apple Watch was released to mixed reviews just a few years ago. Its future was uncertain, to say the least, and the uses for one were limited. Yet here we are, and Apple's smartwatch is the most popular gadget of its kind. And only a couple of hours ago, the Apple Watch Series 4 became official, making Apple's smartwatch better than ever, just as one would expect. 

But here's the thing: as cool as it may be, the Apple Watch Series 4 is also pricey. What makes it different from Series 3 and Series 2? Is it worth upgrading to the latest Apple Watch if you have ...

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