I was just wondering what's the best or quickest way of exchanging my iPhone 6 for a different color if it's past the 14 day policy? I would rather not sell and repurchase unless there are no other options.
Past the 14 days (which is 14 days more than we get, here in Japan!) your only options are to find a friend willing to swap, or find someone on Craigslist. Which is precisely what I did to switch my 6 for a 6 Plus.