I've never noticed this before, but do they always put a real carrier name on these patent mockups? I thought they usually leave them intentionally vague. Looks like Apple is a fan of T-Mobile as well!
Well, Apple's definitely not a fan of AT&T and T-Mobile has a reputation of being the cool carrier that tries to be more like the best European/Asian wireless carriers, giving customers more choices, features that you would expect in 2017 like seamless/inexpensive international data roaming, and a better value.