Well there's another issue: most cell phones with OLED are terrible oversaturated.
Take a look at a good LCD mobile display with accurate or near-accurate D65 color temperature and controlled vibrancy, and it is quite good looking.
Apple phones tend to have good IPS LCD panels, and the quantum-dot LCD panels on recent Sony Xperia phones are terrific.
OLED is great, but so many phones have so-so examples and have colors that are saturated beyond reason. People do find that kind of look pleasing, and is why even expensive TVs come with wild settings that need to be reigned in if you want a truly great display.
That's a matter of calibration on the phone OEMs' part. Displaymate's review of the Note 4 and Edge' displays show that their displays measure among the best.
