Svmuu News CZ mentioned in his personal memoir "Binance Life" that on September 4, 2017, the night before the 94 ban was announced, he received a message on his phone indicating there would be a "major crackdown" the next day. At 12:30 a.m. that day, CZ and executives including He Yi urgently held a conference call, ultimately deciding that he, He Yi, and Heina would go to Tokyo first, while others would temporarily remain in Shanghai.
To prevent being tracked, He Yi reminded CZ during the journey to remove his phone's SIM card and turn it off, which CZ did. However, He Yi later told CZ that this idea came from spy movies she had watched, and she wasn't sure if it would actually prevent tracking.