Is it real? Well, it's a real "arc" reactor that generates plasma, but as we explained in the beginning of the video, it's impossible to create a device that uses less power than it produces due to the Conservation of Energy, a fundamental law of physics: https://en.wikipedia.org/wiki/Conservation_of_energy (summarised as energy in = energy out + losses.)
When we charge the phone, it's just using power from the main battery. Plugging it into the house - also just a skit. Sorry to get your hopes up! But one thing is for certain - it's the most realistic arc reactor ever made - at least compared to the CGI one in the movie.
WARNING: THESE VIDEOS ARE FOR ENTERTAINMENT PURPOSES ONLY. PERSONAL USE OF VIDEO CONTENT IS AT YOUR OWN RISK. THE HACKSMITH IS A TRAINED PROFESSIONAL WHO KNOWS EXACTLY WHAT HE'S DOING. EXCEPT WHEN HE DOESN'T. DO NOT ATTEMPT TO RECREATE OR RE-ENACT ANYTHING SHOWN IN THESE VIDEOS.