What do you mean the SMS interface is not open or set incorrectly?

Turning on the retry mechanism means that after the user fails to send the short message, the system will automatically execute the resend command until the sending is successful.

Just like repeated dialing in the phone settings, if the phone is not connected, the system will automatically continue dialing.

Whether to check it or not can be decided by users according to their personal needs, and it doesn't matter whether to call or not.