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Can a smartwatch be used as a phone?

Smartwatch can have basic function of Smart phone: time reminder, message reminder, call reminder, weather reminder ect, and it has what smartphone not have: health data reminder throught heart rate, blood oxygen, steps, calories, gps, ecg, sleep data ect.

But most smart wathes now cannot work without smartphone, in the future, it’s possible, with the technology of eSIM or 5G network.

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