The movie dives into story right off the title card, no time is wasted with comedians (like in its first part - endhiran) and songs which is something to be appreciated of. While the concept of mobile phones turning against humans sounds cool theoretically, the way it is conveyed in the film through "aura, positive & negative energy, photons" was not anywhere near convincing. Everyone knows that the good will triumph at last but still you'd expect something clever to happen in the middle but the movie only progresses by stunts and visual extravaganza. Apart from few dialogues everything else sounds cliched, and the social message conveyed is conveyed just for the sake of it and too explicitly.
BGM was not bad but nothing really strikes there, bit too repetitive.
One dimensional characters with bad lip sync doesn't help it either.
Watch it for the visual experience.