Hello, I have an unlocked metro (tmobile) S4 and I have noticed that when charging it doesn't turn solid red. Nor does it blink red when having a low battery. I checked to see if both of these features were turned on. They were. I tried the LED tester on the phone itself and only green and blue work. On a third party app, cyan works as well. Still, no yellow, orange, magenta, or red work. It wored on my last S4. Any help plz?