In iOS 14.5, “Unlock with Apple Watch”, which was introduced to improve the unlocking experience of the mask wearing scene, has further expanded the range of functions in iOS 15.
In the new version of the system, as long as the verified and unlocked Apple Watch is near the connected iPhone, you can let Siri execute commands without unlocking the phone.
Compared with the previous practice of using Face ID or a password to open the phone before you can command Siri, the new feature further simplifies the operation. I believe many users should be very happy to see such a change.
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Jane Brown 
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