Joke Collection Website - Public benefit messages - What is the danger of sending an empty number?

What is the danger of sending an empty number?

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Because there is no way to send short messages with an empty number, an empty number means that the current number does not exist and has been cancelled, so there is no danger.

The empty number can't receive the message. The empty number is the operator's empty number. Without users, you can't receive messages to empty numbers.