B5F91083
Re:iMessage with PQ3 Cryptographic Protocol
on Wednesday February 21, 2024 @09:25PM (#39462405)
iOS already has different behaviours inside China compared to elsewhere, for example showing Taiwan's flag or the nine-dash line in the south sea in Maps app.
Based on how those work, the answer is likely: When a SIM from a mainland mobile company is in the device, E2EE is disabled.