1. By triangulating off the nearest cell tower(s) handling the call, one can find the position of a cellphone (roughly). It appears you can purchase this rough information from some providers. Here's a sample link:
2. There is also software available that allows tracking of a phone on a computer using the GPS chip in phones. It's used by some parents to track their children's movements (or by children to keep track of their elderly parents ) There is usually a fee for this service. It's far more accurate using GPS information than the cell towers - you can even track speed (depending on software, provider, etc.)
Note that the phone must be turned on to track, so if I knew I were being tracked, I'd just turn off the phone. Also, if you went inside or the signal was lost due to other obstructions, you may not be able to track.
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