I have a Galaxy S8 and I use Do Not Disturb mode at work. It has three options - No Exceptions, Alarms, and Customs. To me, No Exceptions means no Exceptoons- not even apps marked as priority. Custom mode should be the feature used when you want certain apps or features to work with DND turned on. My problem is that when DND is on you cannot adjust the ringtone or media volume levels, it's locked down. So if I have the media level turned up before DND mode is on I can't change it unless I turn the mode off. If I don't realize the volume is up and I click on a video or something on a web page or app, sound will play from my phone. Why does that happen if I have DND set to No Exceptions? I would understand if I had it set to Custom and had a media app marked as a priority and sound played from my phone, but if I decide to use No Exceptions I shouldn't have to uncheck an app as a priority or make sure my phone volume is turned down - that's the whole reason I use the feature in the first place, I don't want to accidently forget to turn my phone down and something goes off when I don't want it to. I have it set on a timer every day so that don't have to worry about it. I guess my question is, what's the difference between No Exceptions mode and Custom Mode?