one thing I've learned is that 99.99% of the time when somebody doesn't answer their phone, it's not because they're having an emergency. however, as a parent/spouse it's really hard to interpret no response to frantic calls (IE, if I try to reach my spouse and don't get a response on any chat system she uses for 4 hours, I'm going to assume tehre's an emergency, but usually it's jsut that spouse wasn't near phone).
