We use phone calls, Teams and email for communication and urgency would follow the same order, however the majority of my work is with outside clients and so the majority of that is done via email, so have outlook open all day, screen pops when an email comes in (as well as to watch and phone). I can easily look to see if I need to actually open the email properly or just delete or ignore it. Colleagues who need things quickly will generally teams me as we have found it is better than calls as you are not basically demanding to be dealt with then and there.
I have ensured emails dont come through to my watch or phone after 6pm (finish at 5) and before 8am (start at 8.30) so as to give me that work/home balance even whilst WFH.