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How can I distinguish when I receive a "Disaster Alert Cell Broadcast Service message" (CBS or PWS for short) and not a prank SMS?

The first time a disaster alert message is received, a special sound and vibration will be generated (depending on the user's settings), but some phones receive the same sound as a normal SMS.
Reference source:
Taiwan Telecommunication Industry Development Association - Disaster Alert System Q&A
http://www.emfsite.org.tw/PWS/p2.html