Applicable for ColorOS 5.2 device. Check your ColorOS version in [Setting] > [About phone]
What is VIP contact?
Missing on the important calls, when you put your phone on silent mode, or when you set the phone to block calls and notifications using quite time or game acceleration? Now you can add certain contact into the VIP contact list, which will allow your phone to override the settings and have their calls come through the ring.
How to activate VIP contact:
Go to contact > select a contact > click add to VIP contacts.