The WEA test message will be sent by all WEA participating wireless providers to WEA-capable wireless devices throughout the United States and its territories.
The WEA message will read as follows:
THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.
The EAS test will be sent by radio stations, television stations, cable and satellite systems, and others. The following EAS test message will be transmitted in English and Spanish and include both audio and text versions of the test message:
THIS IS A TEST of the National Emergency Alert System. This system was developed by broadcast and cable operators in voluntary cooperation with the Federal Emergency Management Agency, the Federal Communications Commission, and local authorities to keep you informed in the event of an emergency. If this had been an actual emergency an official message would have followed the tone alert you heard at the start of this message. A similar wireless emergency alert test message has been sent to all cell phones in the nation. Some cell phones will receive the message. Others will not. No action is required.
https://www.fcc.gov/fcc-announces-planned-emergency-alert-tests-september-20-2018