Mobile phone pings, call data and mast locations is a subject which I would like to hear more about but it always appears somewhat complicated to the casual reader.
Let me see if I can explain this so a casual reader can understand (which is actually quite important to me).
Mobile phone traffic splits into control traffic and message traffic. Message traffic is when you make or receive a call, get or send a text. It's about why you have a mobile, which is to communicate with other people.
Control traffic is what the telephone system uses in order to work. For example, you fly out from Gatwick, or the Midlands, or wherever. You get told to switch your phone off, so you switch your phone off. The system last placed you at Gatwick (or whatever).
You step out of the plane at Faro and turn your phone on again. Between your mobile and the nearest mast, the system works out from control traffic that your phone, which was in Gatwick, is now in Faro.
It does this whether you have any messages or not. It simply requires that your phone is turned on i.e. communicating with the system.
Unfortunately, this crucial information, the control traffic, does not appear to have entered the files. It is a pity, because it would give so much more information. (I have no reason to believe mobile phone firms kept control traffic info in 2007. I cannot see why they would.)
Assuming this lot is correct, we take a big step forward. We leave behind any ideas about using control traffic, and we focus on message traffic. This focus immediately brings up two ideas. Number 1. To get or send messages, your phone has to be switched on. (Would it be on in 2007 while you were burgling or abducting?) Number 2. If your phone is on, and messages flow, your location can be tracked.
Summary so far. A phone that was sending or receiving messages could be tracked. Question. Just how tracked could that phone be?