have-a-break: How do you send an "invisible" SMS to other country's cellular network undetected? Especially on a mass scale... I know about OMA DM, and FOTA u

have-a-break: How do you send an "invisible" SMS to other country's cellular network undetected? Especially on a mass scale... I know about OMA DM, and FOTA update/access, and binaries certain US operators pre-install into phones/modems for remote access, etc. since I was reverse engineering this stuff. I just don't see how this would be invisible from the targetted country's cellular network operator.