The principle of flash messaging?

Flash messaging, also known as hands-free SMS, is a function of mobile phones, which has nothing to do with operators.

The principle is to add a special logo to the message header, and the receiving mobile phone determines the display mode according to this logo.

However, most mobile phones do not support sending flash messages. Some mobile PC applications can send messages by connecting mobile phones, and STK cards in some places also have this function. If it is sent through the mobile phone itself, the tariff is exactly the same as that of ordinary SMS.

In order to make money, operators in some places have also introduced this function, just like the address above. In fact, the SMS server adds that special flag after receiving it and forwards it to the receiving user.