AT&T Brings U.S. Emergency Alerts To iPhone 4S And iPhone 5 Users
The carrier has noted that AMBER Alerts and emergency alerts – such as man-made or natural disasters, and Presidential alerts -- will be included, and the carrier settings update should be pushed as early as today via iTunes. Wireless Emergency Alerts are part of the FCC’s CMAS program and are mandated by law. You may turn off alerts (except for Presidential alerts) if you choose. Go to Settings >Notifications>Turn On/Off.
When the software update is delivered to your phone, you will see a message that states “Carrier Settings Update: new settings required for your device have been installed”. After that, your iPhone 5 or 4S will receive all Wireless Emergency Alerts by default. As you'd expect, no charges will occur to receive these notices.