My 3G S has a yellow screen, as well as an extremely inaccurate GPS. I called my nearest Apple store and talked to them about replacement phones and made a genius bar appointment. However, I asked them on the phone if they had any replacement phones in stock and the lady didn't know what I was talking about. My question is, they usually give replacement phones in just a white box right? And do they usually have extras available primarily for replacements? I didnt have a 3G, but I had to get my 2G replaced twice and both times they always had replacements in stock. Thanks.