Why don't incoming calls pop up when my Iphone is locked?

Every time someone try s to call me when my phone is locked it never rings or anything. I open my phone and it says missed call, but I never get a notification. If my phone is unlocked it does come through though.

On "don't disturb me" mode?

What kind of phone is it? If it's an iphone make sure you didn't accidentally put it on do not disturb and check the swtich on the left side to see if it was turned onto silent, try moving it back in the other direction

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