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Silent SMS

Silent messages, also known as “silent tms”, “stealth sms” or “stealth ping”, are employed nowadays to locate a person and thus to create a complete movement profile. They do not show up on a display, nor trigger any acoustical signal when received.

I heard it is also possible to get an answer to such a silent SMS from a phone that is completely turned off (sure there must be some energy in the battery still)

How would that work?

  • 2
    If it's turned off, it's not booked into any network. So how should it be able to even receive that SMS? I doubt that's possible. – Izzy Nov 3 '13 at 22:42
  • @Izzy - "Off" doesn't necessarily mean off off. – Compro01 Nov 4 '13 at 0:33
  • Take the battery out. Then it's off, OFF! Unless it's a super special spy agency duplicate of your phone with an extra battery - in which case you should drop it in the ocean, or strap it to the bumper of a bus, or set it on fire...or leave it at your office while you go hunt down the spies that think you are at your office. Then again - airplane mode. – Ecnerwal Nov 4 '13 at 2:27
  • @Compro01 Well, we might get really paranoid and think "they just say alarms don't work with the device off so we think silent SMS can not work then either". And the same "fake" is happening when you turn your device on and it takes a couple of seconds for it to connect to the cell tower (where it then had to be connected to already before powering up). I don't say it can't be done – but it's rather very, very unlikely. – Izzy Nov 4 '13 at 7:43
  • If you search the web, there are many sites, where they say it IS possible (translated: "A Silent SMS will also be answered automatically when the phone is turned off.") . I personally doubt that too. But I could also imagine, that some phones have some decent hardware like RFID or such that could still answer while OFF. – rubo77 Nov 4 '13 at 10:37

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