Wap push sms query

I am a new phone user. I recently received a SMS with the title WAP_PUSH_SI! I couldn’t see how to delete without opening it, upon which it disappeared immediately. Do you know what it is? I have googled information about it and it doesn’t seem to be a hacking device, but what is it and why did I get it? Why did it disappear immediately? Has it done anything to my phone?

Thanks so much, folks.


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