Amazon Prime Video on SmartTV

@Marion There does seem to be an incompatibility specifically with the Prime Video app on Sony Smart TVs with T-Mobile Home Internet.  There are several discussions here about it, and I have suggested before (though not on this particular thread) that the fix is to use a Firestick or Roku.  I'm glad that you found that works for you, and that you posted here.  Returning the TV won't really make a point.  It will get resold as an "open box" or possibly refurb item.  The programmers will never know why you returned it.  If the picture is great, that is what matters!  The TV's OS will eventually be outdated, but can always be replaced with a current external streaming device.