Not all phones can receive WEA alerts as some cellular service provider do not participate in the WEA program. Cell phone devices must also be WEA-capable to receive the alerts.
Check with your wireless provider for more information about their participation in WEA and if your device is WEA-capable.
Below are links to some of the major cell phone carriers WEA pages, provided to us by FEMA:
Verizon:
AT&T:
T-Mobile: