That heart rate sensor on the back of your Galaxy S8 can actually be useful for something
If you're anything like me, selfies can be uncomfortable to take sometimes, and particularly so with a larger device. Certain poses and angles can make the on-screen button hard to reach, while using the volume buttons often leads to blurry photos (thanks, shaky hands!) This is where the heartbeat sensor comes in play: as it turns out, you can actually use it in lieu of a dedicated shutter button, should you choose to.
The way it works is simple: if the front camera has detected a face, tapping on the heart rate sensor will take a photo. Granted, there is a very obvious problem with using the sensor in this fashion: finger smudges on the rear camera. However, this is the very same issue as with the fingerprint sensor's placement, so if you've already formed a habit of regularly cleaning the lens, you should be good to go.
As it turns out, this is not a new feature at all – it actually debuted with the release of the Galaxy Note 4. However, it's now more useful than ever, seeing as the Galaxy S8+ is the company's biggest flagship so far, and thus may present grip problems for some people. So this can be a nice alternative for those who need it, but if the feature is not to your liking you can easily turn it off from the settings:
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