Excuse me, why do I sometimes send short messages to my friends by fetion, and some people can't receive short messages? Why?

There are many reasons for not receiving it. It is possible that the other party's security software or some system optimization software added this number to the blacklist, because the number sent by Fetion is not your mobile phone number, but 12520 plus your mobile phone number or Fetion.

In addition, because it is a mass mailing, it is also possible to add too many friends at a time, resulting in incomplete reception by the recipient. If the content sent is too long, it will also lead to incomplete collection or reception by the receiver.