If you own a WEA-capable smartphone you may opt out of Imminent threats and AMBER alerts, but you can't opt out of Presidential Alerts.
Get device-specific Wireless Emergency Alerts opt out instructions
To view opt out instructions specific to your device go to Device Support. Under Device instructions select Email & messaging > Messaging settings.Learn more
Different types of Wireless Emergency Alerts
Details
WEA are free text-like messages delivered to your device. AT&T does not create Wireless Emergency Alerts. AT&T delivers WEAs on behalf of the state or local Emergency Management Agencies (EMAs).
Three types of Wireless Emergency Alerts
Imminent threat alerts: Notify you of threats to life or property.
AMBER alerts: Inform you about a missing child in your area.
Presidential alerts: Issued by the President (Opt-out not allowed).