Ask HN: How Do Emergency Alerts on Phone Work?
5 pointsby rishikeshs8 hours ago1 comment
  • WarOnPrivacy8 hours ago

         Delivery Method: WEA utilizes a one-to-many alert delivery service
     called SMS-Cell Broadcast (SMS-CB), rather than SMS Point-to-Point
     (SMS-PP). 

     SMS-Cell Broadcast (SMS-CB) is a method for sending short text messages
     simultaneously to multiple mobile phone users within a specific geographic
     area. It is a feature within the GSM (Global System for Mobile
     Communications) standard and is sometimes referred to as Cell Broadcast.
    ref: https://www.etsi.org/deliver/etsi_ts/144000_144099/144012/07...
    • rishikeshs7 hours ago
      Is this a universal standard? How does it override my phone’s volume!
      • Jeremy1026an hour ago
        Typically there are laws dictating how emergency alerts have to be delivered, and your phone's OS will follow that. So "it" doesn't override your phone's volume. Your phone's OS will override it's volume when it receives the alert.