Do I have to enter Fetion software to send text messages by Fetion?

You log in to Fetion to send short messages to the other party, which is free, and the mobile phone login only has a traffic fee. However, when the other party receives your message, it will directly reply to the Fetion message at a cost of 1 dime. The display of your reply is 12580+ mobile phone number as sent by Fetion. Similarly, it will cost you 1 cent to reply to this message directly. If you don't join the SMS package, you won't log in to Fetion to send or reply 18. Of course, you can reply to his short message and delete 12580 when writing the number, just like normal short messages, but since there is a free fetion, use fetion.