Xiaomi posted an official disassembly video of the Mi A3, its new Android One phone. The process seems simple enough: remove the hybrid card tray and pry open the back, then a screwdriver should help you go all the way. The video lingers on the cameras - the triple cam on the back and the selfie cam - as those are the best features on the phone. It also stops to point out the Snapdragon 665 chipset, which isn't everyone's favorite component. The screen specs are conveniently not mentioned in the video. There's a 0.915cc cavity for the loudspeaker, the same size as on the Redmi K20....
Source: https://www.gsmarena.com/xiaomi_posts_mi_a3_teardown_video_that_rushes_past_the_screen_to_get_to_the_cameras-news-38209.php