What functions does the calendar application on the mobile phone lack?

At present, mobile phones are basically a combination of photography, music and intelligence. Plus five is wireless Internet access anytime, anywhere, powerful game operating platform, multimedia software and enhanced photo-taking function. Nowadays, even if the mobile phone is equipped with wearable devices, it also detects routine data such as heart rate and steps. If the mobile phone can be integrated with medical health, it can provide diagnostic functions for some common injuries or diseases, and it also saves the trouble of running around.