How to make mobile phones unable to receive short messages?

You can use the software to switch to flight mode or change the SMS center.

Smart phones can download a mobile guard, and spam messages are directly blocked and unacceptable.

When the mobile phone is not in use, such as when sleeping, it can be put into flight mode, so there will be no SMS harassment. The disadvantage is that not only text messages, but also mobile phones can't accept them.

In the SMS settings of mobile phone, if you change the number of SMS center, you will never receive SMS again. The disadvantage is that you can't receive any short messages, even if the software needs verification code.

To sum up, downloading software is the most convenient. You can collect what you want, and directly block what you don't want, which is convenient and quick.