Read the actual offer
Resolution depends on the programme, edition, service, device and sometimes the plan. A large television does not make every older production native 4K. Poster quality does not describe the stream.
Watch the motion
For sports and fast action, frame rate and compression matter alongside resolution. Try the player’s supported automatic setting or a lower quality if the picture repeatedly stalls. Observe one adjustment before changing another.
Finish the setup
Check captions and audio from your normal seat. Picture-in-Picture, speed controls and other options vary by player. The playback guide separates buffering from access or account messages.