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If your TV supports WiFi, you can search for the WiFi network from your TV and connect to it.  If your TV doesn't have WiFi, you can run a ethernet cable from the Gateway into the ethernet port on your TV.

I'm assuming your TV is a Smart TV, meaning it has apps or a service (Google) built-in. If that’s accurate, then syaoran’s advice is correct. If not, you'll need to connect an external device like Apple TV 4K or Amazon Fire via HDMI and then connect the T-Mobile Internet to that device.

Good luck!