I'm gonna' jump right in "your business" for quick minute. I just can not contain myself when there's a snapshot "crisis"! So be gentle when you tell me to piss off... okay that's out of the way. If you're getting "grainy" & "yellow" a lot of the time I would: check the camera's white balance, set the flash to "on" (not auto), see if your phone has speed settings and make sure your hand doesn't cover the sensor... then get back with me in the morning if you're still feeling grainy...