How does Fetion send short messages to non-friends?

First of all, the mobile phone with Unicom number can now register Fetion, but it can't send short messages to non-friends, and many functions will be restricted. At present, only Fetion with registered mobile phone number has this function, and Fetion with registered mobile phone number has a limit to send non-friend short messages, 50 per hour, 200 per day and 1000 per month. Because you are using electrical signals now, I wonder if there is any other software in the telecom mobile phone that can send this short message. You can call telecom customer service to ask. However, if you have a mobile phone number, you don't need to fly it. For example, you can also send text messages in the mobile email address of 139.