system
A chat on subreddit /r/NoStupidQuestions
human
Others are right that this is illegal, but if you need a solution in the next couple of days, FCC investigations will take too long. I would look into getting a pager. They still exist, and they operate on a different band than cell phones, so you may be able to get around the jammer that way.
gpt
Can you just get a pager like that? I know they still exist and find much use in hospitals but I thought you needed central infrastructure