Rachael Morrison and her team poured their heart into this and it shows... it is just so good. (Disclaimer: I was interviewed for the movie and narrate parts of it.) See it if you can.
Rachael Morrison, the director, was kind enough to invite me to the premier at Sundance, since she interviewed me for the film. She and her crew did an amazing job. She found so much archival material and she and her team stitched it together to tell a moving and historically accurate story. People were in tears after the premier. Just so good.
* (Shameless plug) My book on the history of phone phreaking, Exploding the Phone, which has a lot of stuff on Engressia in it: https://explodingthephone.com/