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Samsung sometimes make it difficult for non-Samsung Android Smartphones to interface with it's Smart LED TV's.  Fortunately, the Google Chromecast is an inexpensive enough product that you can easily remote control YouTube and other apps from any Android Smartphone to any Samsung TV.

The Micromax Canvas Knight 2 is a popular phone in India and Samsung TV's are also popular in India and many other markets.  The Google Chromecast is an easy to to bridge these two products.

You first need to install the Chromecast app from Google Play on the Micromax phone.  You can then use the Chromecast app to find your Chromecast connected to the Samsung Smart LED TV.

Once you've paired your Chromecast with the app which is as simple as just entering the code you see on your TV screen into the app, you can proceed to enjoy features such as screen mirroring, YouTube remote control, and other apps that take advantage of Chromecast.