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An easy way to ensure confidentiality: Flash SMS


Flash SMS is a type of SMS that appears directly on the main screen without user interaction and is not automatically stored in the inbox. Flash SMS is a value-added-service to standard SMS delivery, and is most commonly used to immediately catch a recipient’s attention.  


This feature is most often used for sending one-time, or primary, PIN-codes and passwords, as well as emergency messages that need to be seen right away. Due to the fact that the message is not stored on the phone, there’s no concern of limited storage space, or that the information could be stolen along with the phone. The option to save the SMS still exists, but it is not done by default. 


SMS messages have different classifications. While the regular SMS message is classified as a ‘Class 1’ message, flash SMS messages are classified as ‘Class 0’ messages, which classifies them as most important SMS messages. That is why they get displayed on the main screen without any user interaction needed. However, it’s important to note that users will only be able to see the last message they receive if multiple flash messages are sent.

Another aspect of the Flash SMS is that the sender ID is not shown. This needs to be taken into consideration when sending specific information, rather than PIN codes or passwords. For example, an emergency or utility service notifying customers of power outages, burst pipes, or incoming storms, including the sender name into the content would be a good idea.

So whenever promptness and confidentiality are the most important criteria, the Flash SMS is a useful tool to implement. The parameters can be found in our documentation page and under “mclass." 

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