First of all,does it bother you?you'll get used to it eventually,unless you wanna show off to your friend

sophan, what is your colour setting? motley is going to include gamma option too, might try it nanti  the spreadsheet for colour display is crazy, so many option.
sassychia when you bought the phone, you expect it to have no issues.

wait for a few days first, and compare the screen again. if it is still yellow, then bring along your friend's unit when you ask for a replacement. you have the right to ask for a replacement regardless of what they say, it is a defect on their end. if they don't want to, you can look on how to file a complaintwith the tribunal

First time charge ?
Almost take 2.5 hour to charge complete
after few times charge, i charge it 8 hour
for first time.