Cancel caller ID. Does SMS display name or number?

If the incoming text message is the number in your mobile phone, the Chinese character you set will be displayed; if it is a strange number, the number will be displayed. The text message has nothing to do with the incoming call display, and the number will be displayed regardless of whether the incoming call display text message exists or not. However, I heard that you can hide the number by adding any number in front of the text message, but I don't know what number to send.