Hi, I will be traveling to China in the next couple of weeks and have a connecting flight from Hong Kong. Since unlocked iPhones are legally sold in Hong Kong, I was interested in purchasing one there. However my only concern is that the warranty will not cover it in the US, where I will use it the most. If I buy applecare from the US, will it cover the internationally bought iPhone? Also, since I don't have much time, can I purchase it from the airport (Hong Kong International)?