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15 years ago, I ever installed an application on my Symbian cellphone. That application:

  • can detect any GSM cellphone signals,
  • will list all GSM signal (it written as id on this app like mac address) which is discoverable / in range with my phone.
  • once I select one of them, I can get the proximity where is the selected signal transmitter (in this case, cellphone) might be.

Does this kind of application is still available today on Android?

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  • Never heard of such an app to locate cell phones via their GSM signal. However, there are a lot of apps dealing with cell signals to e.g. locate cell towers. Maybe one of those covers your case as well, though I don't remember having seen that feature listed. Commented Jul 2, 2017 at 15:03
  • Android doesn't give this kind of access to the radios to apps... Take a look at OpenSignal or LTE Discovery, those are about as close as you will get. Commented Jul 2, 2017 at 15:10
  • "can detect any GSM cellphone signals" - as someone who has spent decades developing software for telephone exchanges, cell towers and handsets (not to mention satellites), I can tell you that only the cell tower can detect ‘phones GSM signals. ‘Phones cannot detect each other’s GSM signals. What would be the point? They can detect WiFi & BlueTooth, but not GSM signal; t least, not off the shelf consumer ‘phones. Governments might find a use for packing a call tower into a ‘phone, although I doubt that it could be done. I am certain that you misremember what your Symbian was detecting. Commented Jul 3, 2017 at 10:35

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