No. You will need an external device to use the service. Checkout "Compatible Devices and Browsers" to the right of this page under "DIRECTV NOW Hot Topics".
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Only will interface with the satellite Directv set top box (app is preloaded on tv). Sure would be nice to have the DTVN app but it's all up in the air because AT&T will be coming out with their own streaming device, The Ospry, in 2019. That device is intended to transition the satellite subscribers to streaming and the box will have dtvn as one of the streaming packages. I hope the Ospry doesninterface with the Directv app on LG tv's.