I like the SIM card feature.
When I am on call, I wear my Apple Watch. It’s waterproof, so I can wear it surfing, swimming and kayaking. The iPhone is waterproof, but it’s easier to just leave it in the car.
I like the EKG functionality on the series 4. I occasionally get a junctional rhythm. It is a satisfying in a nerdy way to see the waveform. The watch plus an app gives you a lead I EKG tracing.
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