Wirelessly posted (BlackBerry 9000 4.6.0.67)
Well with a fairly limited degree of accuracy you can use cell tower triangulation. Its how google maps locates you without GPS. As for locating and tracking it would have to be some type of app installed on the berry. TeleNavtrack had an app that tacked via cell towers and you can remotely view the breadcrumb trail. It didn't use gps at all and once started ran in the background. He might have hidden the icon and thus hid most traces of the program.
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