SMS messages are more adaptable than many would think. Different types of message can be sent by altering setting(s) in the headers. One of these is Flash SMS, or class 0 SMS messages.
A flash SMS message will not be stored in the phone memory for later reading, but will flash onto the screen. This cold be disconcerting to the phone user who may be doing other more important tasks and should perhaps pnly be used for urgent or emergency messages. Standard SMS messaging systems do not allow these messages, so the developer must alter the header settings through some programme.
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