Samsung is busy rolling out the new One UI to its flagships (including older models). It has been a long road getting here, so the company published an infographic detailing the key ideas that were introduced with each Galaxy S generation since the begging. It starts with the original Galaxy S, but the first iterations of the current features landed on the Galaxy S III, which introduced S Voice - the forefather of Bixby. Also, Smart Stay kept the screen from switching off while you were looking at it. The Galaxy S4 built on that and would automatically pause a video when you looked away....
Source: https://www.gsmarena.com/infographic_the_interface_novelties_on_galaxy_s_phones_that_led_to_one_ui-news-34932.php
