Work. Slack, texts, calls (could be anyone in my department whose number I don't know), PagerDuty, the random number PagerDuty call from. More of a pain to whitelist than to just avoid random apps with notification.
You have to specifically allow notifications after you install and launch the app. Just say “no” when it asks you for permission to send you push notifications.
Good luck, it sounds like a nightmare to be on call all the time.
One week out of five (rotation). Our software has to work (and work well) 24/7/365.