Why did the empty number send me a text message?

This is nothing strange. As long as the customer has enabled the SMS function, this number can be used to send SMS, and of course spam messages can also be sent. If it is a number that specifically applies for sending spam messages, of course, you can also apply for closing the call service. For example, the online experience card I'm using now can access the Internet with 3G traffic, and I can also send and receive short messages with this number, but I can't answer the phone, which means that the number you dialed doesn't exist. It's just that the operator has turned off the call function.