On a 6-inch phone screen, the pixel density is high enough that the difference between 480p and 720p is often negligible to the human eye. Understanding "Best" Quality in 480p
A 480p video with a high bitrate will look significantly better than a "starved" 720p video. Aim for files that haven't been overly compressed to the point of "pixelation" or "blocking" in dark scenes.
A standard 480p movie file typically ranges from 300MB to 600MB . Compare this to a 1080p file, which can easily exceed 2GB. For users on limited mobile data plans, 480p is the most economical way to enjoy full-length films.