Hi guys, I'm new here and I have question about the white iPhone 4. I'm trying to buy a locked white iPhone 4 on craigslist. The seller gave me the serial number of the phone: 88020xxxDZZ. I checked it with Apple website and it said the warranty is expired. I don't think it's the original white since the white one just came out couple months ago. Anyone know what's DZZ mean? I read somewhere that A4S = 16G black. A4T = 32Gb black.