The S20 does away with Samsung's heart rate sensor, a feature that's been with the S series for a long time. Many people use this feature a pulse oximeter with Samsung's Health app, so you may be surprised to find the S20 no longer supports the feature. May this isn't acceptable in my opinion, the the 21 series has no sd card option ? I belive the heart rate sensor was removed for financial purposes. This leads people to buy the wearable tech.
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