Yellow tints on iPhone

[Alexa12370]

My iPhone 4 problem has some yellow tints at the corners of the display screen and even yellow lines on the display screen. What could be wrong?

 

[EWyatt]

How old is it? Still under warranty? If so, take it to your place of purchase and have them evaluate. ATT will help for sure.
BTW, under certain lighting conditions, all iP4s will show a little yellow, temporarily. Try to manually adjust/increase your default brightness in the iP4's setting and see what happens. And again, if all else fails, get back to the store!