If you wanted to get very fancy you could log into a system closer to the towers and check the reports on cell tower power that your phone periodically sends to triangulate better. ![]() If you have access to the network where the user is you can use either dedicated location systems if they have them or use the VLR method above for a rough location. Lots of guys like SMS aggregators and small MVNOs have access to this. This works even if the number your tracing isn't on your network, but you need to have access to "a" network to do it. There are DBs that match codes to lat/long. Most of the time after a few pings you can get 2 or more cells, enough for a decent approximate location. JFTR, sending someone a really awful ringtone (a single diminished fifth or something) is way more annoying than sending them "0" as an operator logo, especially if their phone only has one ringtone.īack in the day they would use lower level routing commands (eg SRI lookup) to find the VLR and then cell towers codes of the phone. Over the course of that project I sent so many of those text messages I still can't get the code //SCKL1581 out of my head. First thing I tried once I had some PoC data was to send a message from my phone directly to a colleague. On first reading I assumed the "header" part would require direct access to the SMS gateway, like the SMTP HELO or similar. The message just had to start with "//SCKL", followed by a code, followed by some data. On some phones there wasn't even an alert, it would just obey, silently. If you were lucky you would be told where the file had come from, but often the phone just assumed it was an update from the network. ![]() I was surprised to discover that this was triggered by sending an SMS, because there was usually no indication that a message had been received. The exact UI was phone-dependent, but typically these updates would pop up a confirm box saying "Accept new ringtone?" or something similar. I was given access to an SMS gateway, a PDF of the Nokia message format and a deadline. Back around 2000, shortly after The Matrix came out and everyone was buying "those" Nokia phones, I was tasked with writing a couple of applets for a certain UK mobile phone operator.
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