Walk A Mile
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The phone needs to know which tower it is going to talk to so it contacts the towers. Smart phones do more again, obviously they have GPS. There is also the phone records of who and where was contacted.
Who did someone ring in Belanglo?
The iPhone 3G released in Australia mid-2008 and had GPS capabilities. The original iPhone from a year earlier lacked that feature. Smartphones weren't very widespread at that stage; global iPhone sales by 2009 were 7 million, and Australian sales were estimated to be around 200,000-250,000. Unless DH was an early adopter of smartphone technology, it seems very likely triangulation/tower information was used rather than GPS.