I recently travelled to China for work. To my surprise our IT department confiscated my iPhone and iPad saying they could not secure the data or communications on my devices against prying eyes.
When I complained saying I would leave them in Airplane mode and remove the SIM cards they said that wouldn't be enough to secure my data on these devices. Instead they gave me a mobile phone for the duration of the trip that was not a smartphone. It had no data connection per se, a physical numeric keypad, no touch screen or apps.
I want to know why putting my devices in Airplane mode and removing the SIM cards is not enough to secure my data from prying eyes? The IT department wouldn't answer that question!
I also want to know what else I could have done to secure the data on my iPhone and iPad, or is there no way to properly secure data on these devices?
I go through phases of being rather paranoid, so that's the reason for wanting clarity on this. It's also one of the reasons I use Apple products, but this experience has got me spooked.
Both devices are running iOS 10.3.3.