How to display the mobile phone number by sending a text message by Fetion?

Hello, first you log in to Fetion PC client. After logging in successfully, find a friend, click the right mouse button on the friend's name, and check the item "reveal your mobile phone number to the other party". In this way, when you send a fetion to the other party again, the message received by the other party will be displayed as 12520+ mobile phone number instead of 12520+ fetion. Please refer to.