I was looking out for quite some time to learn about making the Apple logo glow on the iphone just like it does on the macbook.
HERE is a youtube video i found explaining the entire process for iphone 6S and 6S plus-
For iphone 6 and 6 plus-
Disclaimer- This might void your warranty
P.S- It's still worth giving a shot 😉
SOurce:theUnlockr