This teardown video of the Samsung Galaxy S21 5G shows that the interior is quite similar to that of the Galaxy S20 before it. To get inside, the plastic back must be removed first. And yes, it’s very much a plastic material – not even a hint of glass here.
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https://www.gsmarena.com/disassembly_video_shows_the_galaxy_s21_internals_havent_changed_much_since_the_s20-news-47264.php
