While it was only the audio, it was a security breach that Ruffalo thought might cost him his job.
Mark Ruffalo might have been a particular target for the reported phone ban, as he hasn’t had the best luck with spoilers historically– especially related to his phone usage.
He also directly referenced Thanos’ snap in an interview ahead of Infinity War, although nobody seemed to put it together at the time.
He infamously streamed the first 20 minutes of Thor: Ragnarok from within his phone.