Its a phone, its not a monitor to be calibrated, I have seen HTC phones with a huge variation in screen color, a Galaxy S II with pinkish hues, anyone changing their phone 7 times because they don't like a slight tint that their last phone didn't have (and bluish actually makes things look worse) needs to get a grip.
Apple seems to be the home the of the ocd tech user more than anywhere else (yes I am one too but have a bit of control here), Who ever said Apple should make perfect phones and computers? They are mass produced like everything else these days and by the tens of millions. Apple are making a fortune out of elitism, you think because its Apple it must be top standard, that's wrong you paid more for the same product as an android user or Nokia user pretty much, as there is only so much variation with circutry and casings and new phones out already make the 4S which I own look dated anyway. Nothing about the 4S or 4 warrants the cost we pay, we just pay top dollar because we like the phone and brand, bigger fool us it seems as we could get more for less elsewhere if we wernt so hung up on the Apple brand.
If you dont like the tint get another phone brand, it really is just a smarphone nothing more nothing less, now go enjoy your lives.