thats the same thing I thought about and went looking for how it works and as you can see in the link I posted it hardly works in real life
surprise! Its samsung! The phone is filled with supposed "advances" and "gimmicks" that are purported to work, yet in actuality are buggy, ineffective, or straight up dont work! Hell, Samsung claims by Note 2 is supposed to detect my eyes and neve turn the screen off, yet after activating feature, the thing works like 10% of the time! Complete garbage. The gimmicks that Samsung are pushing are doing nothing than cheapening the concept of mobile phone technology and development. Its disgusting.