Does Fetion have to add friends when sending messages?

Yes, Fetion should add friends first. (Only mobile phone number can be added)

If you send a message to the other party through Fetion without adding you, the other party's mobile phone will only receive information such as "confirm the invitation to be friends", and you can send a message through Fetion normally only after the other party replies "Yes" to become friends.

Lingxin and Fetion are similar, except that one is mobile and the other is Netcom.

I hope my answer is helpful to you.