The Department of Telecommunications and the National Disaster Management Authority have teamed up to test the Cell Broadcasting System, an emergency alert system that sends messages to all mobile devices within a specific geographical area. As part of the trial, users might receive test alerts with sound and vibrations. It's important to note that these trial alerts are not real emergencies and do not require any action on the user's part. To stay informed about the progress of the trial, users should look out for updates from the DoT and NDMA.