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CMAS capable Mobile Network Operator.  Whether or not the message is displayed will vary by handset and carrier. The tests will begin once the CMAS is deployed. Deployment time varies across the country and by carrier.
• The message header is "RMT alert," followed by an explanation that this is a CMAS test, and ending with the Common Alert Protocol (CAP) fields that will be populated in most CMAS messages. These tests are mandatory for carriers participating in CMAS, and are initiated by FEMA, who owns and operates CMAS.                                   - Paul Kosel