Can You guess why? Thats right - he also had a policy to not take phone calls from unknown numbers (especially foreign). They had to go to ours country ambassy in Spain (which took a while) and beg for help.
Since that day his father answers all calls :)
Neither of these calls often. Maybe once a year you get call like that. But when they call, you really want to pick up.
Only my close family are whitelisted.
Most time people call twice during an emergency. You could also say to call back again in case of emergency in your voicemail message.
I have stranger phone call anxiety and the other thing is spam/scam calls. Which thankfully my phone has been good at flagging/blocking.
Regarding notifications I used to have phones that either had LED blinking indicators or sound/beeping ahh, crazy used to just drop what I was doing to check it.