Is there any Android software that can be like Fetion, where one party is not online and the information is sent to the mobile phone in the form of SMS, and it is free?

Wechat is Tencent's, as long as the other party is your QQ friend,,,,, but all these softwares have the same shortcoming, that is, you have to install this software on the other party's mobile phone to receive it, which is disgusting.

Speaking of it, Fetion is more in line with your requirements. Recently, I heard that there is another flying chat on the mobile. I don't know how it works.