How do I know what model I’m buying when I order from Google Play?
It’s location based. If you’re buying from North America, you’ll be ordering the D820, which has LTE bands for AT&T, Sprint, Rogers, Telus, Wind and T-Mobile (as well as other, smaller carriers). If you’re ordering from any other supporting country, you’ll be buying the D821, which has LTE Band 1/3/5/7/8/20 support.