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Generally you wouldn't need any type of messaging to the handset for this. As the phone periodically reports the signal strengths of surrounding cells for the p
by ian0 8y ago
Generally you wouldn't need any type of messaging to the handset for this. As the phone periodically reports the signal strengths of surrounding cells for the purposes of handover just taking a glimpse of this is enough to triangulate well.
As long as your phone is on your broadcasting. Indeed I think there are cases of tracing where the phone is switched off too, though not sure if they used historical cell data to guess at its location or there is some secret sauce.
But - as you mention, you require to have connections into an operator to do all this.
- thesimon 8y ago>As the phone periodically reports the signal strengths of surrounding cells for the purposes of handover just taking a glimpse of this is enough to triangulate well. Not when the phone is idle and is not leaving a location area though. (At least that's my memory from my college class)
- codedokode 8y agoIf you put your phone close to your amp or sound card and if they are not perfectly shielded then you can hear when the phone is transmitting the signal. You can hear modem-like sound before receiving a call or a message, and in idle mode the phone usually transmits something every 15-30 minutes.