A case maker has sent to gsmarena more info about the upcoming Samsung Galaxy S8 and S8 Plus with precise measurements.
If you observe close the two pictures above, both smartphones models are presenting sided curved edges on the diagrams, with the only difference in size. Of course the S8 Plus is larger and wider than the the S8 as you can notice.
Both are apparently bezel less , have not home button and the USB is a 2.0 not a USB-C type.
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