My prayers go out for the victims.
Without cell service, your mobile phone may not be a virtual brick. Don't forget most modern mobile phones have the ability to latch unto a local area network (LAN), which is separate from the cell phone service. So, don't forget to try that option in a crisis. Access to a LAN would enable me to burst out an email at least. Also, I think networks like LTE are on different towers than the cell phone.
I'm not saying these other options are super reliable. I'm just saying these are other options to try.
If you're reading this, it's too late.