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This article is effectively claiming that SIM card hardware has a back door built in.

• gaspoweredcat 7y ago
  i believe it is and it may well be right for the most part although likely with a caveat or two, id wager it cant do much else than report certain info back and it would rely on the sms app having location data permissions (admittedly most will have agreed to this) ive been hearing rumours of something like this coming out of russia where its referred to as "pelengator" (searching will reveal little other than a vehicle tracking app, ive heard about it from various gsm forums and chats etc but wasnt convinced it was real)