Hello. I'm currently in NYC and am with AT&T, out of contract. I want to get the iPhone 6s Plus before I move to China in November. Which model should I get for the best support for LTE? I'm moving to Shanghai. Here are the LTE band specs for each model as shownon Apple's site: For the iPhone 6 model, I should purchase it through Sprint as that particular model had best support for the LTE bands in China. Is that still the case with the iPhone 6s models?