It can be done with any cell phone by using triangulation, but this is not normally available to just anyone. My understanding is most local police are able to work with cell companies to have this done though:
from ehow.com
"Cell phone triangulation collects data and traces the approximate location of the cell phone in question. Because cell phone triangulation requires tracking the strength of the signal from cell phone towers receiving a signal, normal citizens will be unable to perform this function without paying a company for their technology. Once the information is gathered the coordinates will pinpoint you to the position within 25-100 meters of said cell phone. Read on to learn more about how to triangulate a cell phone."
Has been used with success to find hikers lost in remote areas:
"Denali National Park (Alaska) - Two hikers who got lost in the Alaskan wilderness are now safe thanks to some crafty cell phone triangulation. 25-year-old Abby Flantz and 23-year-old Erica Nelson had gone out on what was supposed to be a one night hike. A search was called after the pair didn’t come back the next day..."
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