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Mobile telephone handsets attached to 4G networks that have made or received a phone call in the preceding hour will be included. Mobile phones on 4G networks that have not made or received a call cannot be detected by Emergency Alert warning system.
4G mobile telephones used outside the 4G network coverage areas revert to the 3G/2G networks where they can still be detected by the carriers and can be sent a warning message from the Emergency Alert system.
All mobile telephones on the 4G networks will continue to receive messages based on their registered service address.
All three carriers are investigating a 4G solution that is compatible with Emergency Alert.