If News of the World employees could hack into 13-year-old British schoolgirl Milly Dowler's cell phone in order to retrieve and delete her parents' anguished voice mails, then they had technological access to it.
A cell phone, just like a GPS, is a geolocation device:
Geolocation data is information generated by electronic devices – including cell phones, Wi-Fi equipped laptops, and GPS navigation units – that can be used to determine the location of these devices and the devices’ owners.
In other words, it can be used to locate its owner. The cell phone hacking presumably started when Milly disappeared in 2002 until she was found murdered six months later. Why didn't News of the World give this information to the police in time to locate and save Milly's life? In their craven eagerness to scoop the competition, did they doom Milly at the hands of her vicious killer?