When you get a notification in your pocket that you've missed a package, but the message is vague, it's a universal annoyance for most Americans. The Federal Communications Commission (FCC) cautions that the first inclination you may have is to send a text message "STOP" to put an end to the madness, but it may end up proving you have an active number. The offhand answer may encourage even more junk, and a stealth response may be more effective.