Network
TCP multipath is used for Siri
https://news.ycombinator.com/item?id=40090216
https://developer.apple.com/documentation/foundation/urlsessionconfiguration/improving_network_reliability_using_multipath_tcp
Security
If you are about to be confronted by a cop:
On iOS, click the lock button five times. The biometrics reset. A passcode is required.
If you are about to cross a border:
Power your phone off. On iOS this clears any keys stored in the Secure Enclave and it’s much harder to get a forensic image.
https://news.ycombinator.com/item?id=40182443