Understanding Class 0 SMS (Flash SMS) on iPhone

A Class 0 SMS, or Flash SMS, is a special type of text message that is displayed immediately on your screen, is not stored on your device when you dismiss it, and will notify the sender that it has been

received. Flash SMS messages are sometimes used during emergency situations, however these messages may be used in an attempt to fraudulently acquire personal information from you, such as your account password or

credit card information, or encourage you to visit a misleading website. Be cautious of messages sent to you by someone you don't

know.

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Original Title: About flash message