Hi guys, I just received a new iPhone 6S 64GB Silver. Now compared to my iPhone 6, the whites on the 6s are tinged with yellow quite noticeably. I have got a replacement for it and it's exactly the same. I phoned apple and they said this shouldn't be, the colour should be exactly the same as my iPhone 6. They told me to call provider and get another swap, i'm wondering if this is normal or if anyone else has noticed this? Would like some advice on this please. Thanks.