Its to do with marketing. If you walk into a best buy and look at TV's the settings are set to really pop, look at me mode. Take the TV home and your eyes will bleed. Samsung TV's have a setting called "standard" that is nearly perfectly calibrated.
Some phones like the note 2 have these settings too. I dont know how well the are calibrated but I heard there is one setting thats pretty damn good.
Plus OLED tech in mobile devices still have a long way to go. If you do comparisons of HDTV OLED vs LED/LCD you'll find they generally do better in most categories. I think the mobile OLED just have a ways to go. There is PLENTY of room for improvement in the tech whereas LCD is about done even in mobile devices.
As of now though I think the most accurately calibrated mobile device you''ll find is the iphone (maybe an HTC device too?). Also some people prefer quantity over quality, and some people just prefer the vivid colors. I'm willing to bet you'll find quite a few people that bash Samsung for their screen quality have their TV's at home set too movie or even worse that god awful dynamic mode because the PREFER it over spending 20 bucks or borrowing the tools to properly calibrate the TV...
