3 ms·

Does that mean this comment is incorrect? https://news.ycombinator.com/item?id=7844350 https://news.ycombinator.com/item?id=7844350

• revelation 12y ago
  Checking the cell ID can be used to detect an IMSI catcher, but it requires knowing which cell IDs can be trusted. That requires some kind of cell ID whitelist and can be a pain to maintain / prone to false positives. Notice however that CatcherCatcher does a lot more than just detecting IMSI catchers. It also detects when you receive a "silent text message". Law enforcement works with mobile network operators to continously send these text messages to a mobile device. The baseband in the device then wakes, communicates with the nearest cell and thereby reveals its proximate location, without ever notifying the application processor that anything of note has happened. This allows for tracking a persons movement around cells at pretty much zero cost and can be done from any point in the world, unlike the IMSI catcher that requires you to be close to the target for it to pickup on the fake network.