Do not disturb iphone feature?

I have an Iphone 4 and I turned on the "do not disturb" feature and changed the settings so I only receive phonecalls from my favorites list. What happens to everyone else that tries to call me? Will they know my phone is on do not disturb or will it just go to voicemail?

It'll still call, but it just won't make sound

Neither.

The call would (to them) be normal. If they chose to leave a voicemail that's up to them. You of course wouldn't know until you either check the phone or disable the mode.

There's no way for someone calling to know your phone is on DND.

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