On April 5, 2016, Apple showed the world that the Siri permissions (Siri access levels to your iDevice) can be changed remotely at any time, server-side:
Via @washingtonpost: An Apple spokeswoman confirmed that the bug was fixed Tuesday morning. Most consumers should have a fix in place – without the need for a software update.
Over time, Apple has quietly prevented several Siri “features” by server-side, remotely, so at any time can be opened and closed again, in case of… , without your knowledge, and you would never know.
Even, server-side Apple can give Siri unrestricted/unlimited access to our iDevices; an “authorized” person could get full access to any iPhone in the world by asking Siri with a specific secret voice command that could be changed at any time.
Could Siri be used like a backdoor?
Still at present, Siri shows all reminders and events in calendar, and allows add, modify and delete, without asking for passcode.
Would not you like to keep private your tasks, dating, medical appointments … no losing the power of Siri on lockscreen?
I think would be great a handful of switchers on Settings – (Touch ID &) Passcode – Siri ; We could choose what Siri does and what not when our iDevice is passcode-locked, gaining privacy without giving up Siri on the lockscreen.