So this movie is sequel of robot. The story starts with a scientist hanging himself on a mobile tower, as the story progresses smartphones are suddenly thrown in the air out of people's hand, everybody is confused and terrified and unable to understand what exactly is happening then a bird like creature appears and it's made up of those smartphones. When everybody is helpless dr. Vashikaran decides to bring back chitti to face the situation. Special effects are good but you can not compare them with Hollywood movies.
Story is good but it could be presented in more interesting way.
I watched this movie in 2d but It would be better if you watch in 3d. Overall movie is one time watch and gives a strong messege how our smartphones are killing innocent birds.