After the Galaxy S21 and S21 Ultra teardown videos, the third phone of the family received the same treatment - here is the Galaxy S21+ disassembled. In the process of taking the phone apart, YouTuber PBKreivews discovered the distinction between single and dual-SIM models. It’s mostly in the software – all S21 models have two SIM readers, but in single-SIM versions one of them is disabled. It may be possible to flash a different firmware to enable the second reader. You’ll also need a new SIM tray, one that can hold two SIMs. The Galaxy S21+ in the video is the Exynos-powered version...
Source: https://www.gsmarena.com/samsung_galaxy_s21_teardown_shows_the_difference_between_single_and_dual_sim_models-news-47380.php
