Oppo
Allow Calls During Do Not Disturb auf Oppo
Do Not Disturb on Oppo mutes calls, alerts and notifications by default. That includes phone calls, which is fine for meetings but risky if you are waiting for a call from family or work.
Coloros lets you punch a hole through the silence for specific callers instead of turning the whole mode off. You choose between allowing everyone, only people saved in your contacts, or a short list of selected contacts you pick yourself.
There is also a way to mark one individual contact so their calls always ring through, even when your general filter is set to a stricter option like contacts only. That is useful for a partner or a manager who needs to reach you no matter what.
To set this up, go to Tap on Settings ➔ Tap on Sound & vibration ➔ Tap on Do Not Disturb ➔ Tap on Allow calls from ➔ Choose an Option.
If you still miss calls after setting this, check whether Do Not Disturb has a schedule running in the background, since a scheduled session can override manual changes made earlier.