so all three galaxy s20's allegedly have a resolution of 1440×3200 pixels. i personally have the regular s20 5g. but whenever i go to any of those "whats my screen resolution" websites, i get a result of 360×800 pixels. why is that? i thought the galaxy s20 series phones are all 1440p but i get a totally different answer on these sites.
You can go into your settings and check what your resolutions is. To put it simply, those sites are wrong. If you had a 360x800 resolution, you'd see it.