In South Korea they were a bit overused I think. In addition to hand washing reminders, each phone is getting up to 2 loud but not-really-quite-actionable alert

In South Korea they were a bit overused I think. In addition to hand washing reminders, each phone is getting up to 2 loud but not-really-quite-actionable alerts per day, which report on 2–3 new cases discovered in nearby city districts. (But then the government uses the same alerts to notify about strong winds and elevated pollution levels, so it’s more or less a given.) The ones from yesterday were the first to ask people to limit their mobility.