The system uses preferably Cell Broadcast technology to deliver predefined emergency messages.
Examples of successful nationwide reverse-112 implementations can be found in Japan, Taiwan, South Korea, United States, Canada, United Arab Emirates, Saudi Arabia, the Philippines, Oman, Romania, the Netherlands, Greece, Chile, Peru, China, Russia and New Zealand.
Location based SMS has been chosen to deliver public safety alerts in Sweden, Australia, Norway, Singapore and the Indian states of Odisha and Andhra Pradesh who have implemented multi-channel Early Warning Dissemination Systems (EWDS) as part of the National Cyclone Risk Mitigation Project The European Electronic Communications Code (EECC) has agreed to support the deployment of a wireless emergency warning system whereby all people – locals and visitors alike – within a certain range of an incident receive a warning message.
[1] The purpose of the new European Reverse 1-1-2 system, is to communicate information regarding potential hazards (man-made or natural) to EU citizens via their phones, through a geolocalised message-sending technology.
This type of warning should allow citizens to evacuate or avoid a danger zone more quickly thereby reducing the chances of casualties.