How to send short messages by Fetion on mobile phone?

The other party needs to open Fetion service. If not, you can invite him to open it. After adding friends, you can send short messages through the client. The other party is online like QQ. If not, the message you sent will be sent to the other party's mobile phone by SMS, and the other party will reply the normal SMS fee through the mobile phone. Now smart phones can send short messages with traffic even if they don't log in to Fetion, and they only charge traffic fees, so you can try it.