Can the health code mobile phone change color when it is turned off? The answer is: you can change color.
Because the current mobile phones are all smart phones, although they are turned off, they just can't receive the signal at that time. Once your mobile phone is turned on, its signal will be transmitted to your mobile phone immediately for everyone to check at any time.
The current epidemic situation is not good. Although everyone has a health code, I suggest you never travel to other provinces. Stay at home more, remember.