Who has received a text message that is not like a text message, and it is a bit weird.

I remember that I received a message from a number with all zeros several years ago. It was still in the middle of the night. During that time, I was fascinated by horror movies. I hesitated for a long time. When I opened it, I saw that it was a blank message with nothing. I remember that at that time, the color-screen mobile phone had not come out, and the blank message should not be sent out (it seems that there is some software or something that can be sent now, but I don't know much about it), or I was scared by this strange number. It's ridiculous to think of it now ~~

As for now, it seems that there are many softwares that can get some inexplicable short messages, but if you accept them, it has little to do with intelligence.