What does the do not disturb switch do?

On my IPhone, I wanted to see what the "Do Not Disturb" button does. Everything worked, messages, emails, and calls. What does it do?

Lol. Ok the "DO NOT DISTURB" means no calls from any contact except the ounces you've chosen whenever the button is turned on.

Mine is set with 12am - 5am I can only receive calls and messages from my Fav list contacts. It helps allot mostly when you need some time to your self. Instead of switching off the phone or turning on the Airplane mode button, you activate the DO NOT DISTURB. Meaning your phone stays on, you can use it but no one can disturb you.

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