Hey guys, I'm looking to purchase an iPhone 5 in either US or Canada (my wife is from America, while I'm from Canada) next month. We will be moving to China in Spring 2014, however, so I want to make sure my phone will work in Asia. Should I go for the A1428 or the A1429 model? Based off some preliminary research, it seems that Canada sells only the A1428 model. I also want to make sure my phone works in the US and Canada whenever we come back to N. America to visit. Any advice would be greatly appreciated!