@amarand @NoMansWoman
Is this traditional text message or Imessage? since traditional text doesn't need a human reply. They will check if they get a DLR (Delivery Report) from the network unfortunately. Replying add an extra flag. No protection possible against this and most of those numbers are fake/created anyway.
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@amarand @NoMansWoman
nvm i didn't click/saw the image. then yes, just receiving the message is enough for them.