What's the difference between logging in to Fetion by computer, sending messages and sending messages? Is there a charge for sending short messages by Fetion?

Hello, sending Fetion messages is free; If you send a Fetion message, there will be a charge (if you are a mobile Fetion user, it is free to send a message to a mobile Fetion friend, and you have to pay for sending a message to a Unicom telecom user or a non-friend). In addition, sending a Fetion message, whether the other party is online or not, is received by the mobile phone; Fetion messages are all received by the client.