While it does look significantly different from the outside, the Galaxy S21 Ultra is, to some extent, an incremental upgrade compared to its predecessor. Almost all the internal components have been upgraded, as one would naturally expect, with only a few notable standouts. One of those is, of course, the display panel that’s now compatible with an S Pen stylus.
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https://www.slashgear.com/galaxy-s21-ultra-teardown-reveals-the-bigger-fingerprint-sensor-28657259/