Do Not Disturb is turned on or off by swiping down from the upper right corner of the screen to bring up the control center.
You can use the Do Not Disturb feature on your iPhone whenever you want to silence any calls, texts, or other notifications.
'What is Announce Calls on iPhone?': How to enable Siri to announce who's calling you on your iPhone
The Announce Calls feature on iPhone was introduced with iOS 10, and when enabled Siri will "speak" the name of the contact calling you.
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