How to hide the number by texting?

1. Now many mobile phone softwares can also send short messages, such as

Yixin, you can send short messages to other people's mobile phone numbers for free through this software.

2. Send short messages on the computer by Fetion. Just press the contact information in "Menu Bar-User-Personal Information-"in the lower left corner to set the phone number as confidential or not to enter the phone number.

3. There is also the need to go to the business hall to handle the hidden calling number business. I have never done it, but it seems unclear that the calling phone package does not include SMS, but I think it is not easy to handle that process in general. After all, short messages that sell money online need to be paid by operators, and it seems unlikely that things that sell money and do business will be free.