Here is a chart showing how T-Mobile US's coverage has changed over the past 3.5 years on each band. Data comes from T-Mobile.

The app cannot handle the length of my username, resulting in it being cut off and the button to switch accounts, add an account, and sign out being hidden.

Edit: Also, the swipe action for downvote seems to upvote instead.

Edit 2: Correction, the swipe action seems to depend on how quickly I do it. If I do the gesture quickly it upvotes no matter what.

Edit 3: Seems to be fixed as of 1.0.44.