In the United States, cell phones play an important role in the rapid dissemination of public alerts and warnings. In 2012, FEMA began the nationwide rollout of the Wireless Emergency Alerts (WEA) platform as part of the Integrated Public Alert and Warning System (IPAWS). WEAs enable emergency response personnel to send messages to wireless subscribers within range (at the county level) of an active incident. WEA messages do not require a subscription for receipt and are available for use by authorized IPAWS alerting authorities.
Bennett, DeeDee M., "Moving Towards Accessible Wireless Emergency Alerts: Sending and Receiving" (2014). Public Administration Faculty Publications. 86.