The Xiaomi Watch 2 supports APP notifications. When your watch is connected to your phone, open the Mi Fitness APP and go to [App notifications] to enable this feature. You can view phone notifications on the watch, which are displayed in a list. However, the watch does not support folding or replying to these notifications.
By default, the watch vibrates for APP notifications without lighting up the screen. To view the messages, you can either raise your wrist to wake the screen or manually activate the screen.