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The heart-rate sensor really used to make samsung phones stand-out. Personally, I'd love it if they added it again. : r/samsunggalaxy
Galaxy S21 Series: 7 Things That Make It Better Than Previously Thought - SlashGear
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Samsung Galaxy S21 Ultra review: a top phone that's been replaced | TechRadar
Does the S21 have a heart rate sensor? : r/GalaxyS21
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