According to Apple, the Apple Watch is already the most popular timepiece in the world. Despite that apparent dominance, the company is introducing two new versions this autumn; the Series 3 and Series 3 with cellular. Yep, Apple is finally launching a 4G-capable smartwatch, meaning you can track your runs, send iMessages and quiz Siri without your iPhone. Both editions have new internals too. Apple has equipped both with a faster dual-core processor and a new W2 chip, which improves WiFi connectivity and power efficiency. There's also improved heart-rate tracking, which can detect sudden, potentially concerning spikes when you're not exercising.