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SMS class

There are 4 different SMS classes.

A normal SMS is class 1; these get stored into the phone or on the sim depending on configuration and available space.

The message you received is a class 0 SMS. According to the specs, these should be shown immediately and it's not necessary to save them. They are also known as flash SMS'es and some phones can send them.

A class 2 SMS should be saved directly on the sim and a class 3 SMS should be 'forwarded to an external device'. No idea what that means...

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