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Old 7-May-2012, 7:06 AM   #3
ghz24
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Join Date: May 2011
Location: Central Illinois U.S.
Posts: 71
GPS not needed on all phones.

Some phones have a hall sensor and can detect magnetic fields with out needing the GPS functions. The one i saw was in a building and couldn't see the GPS satellites but knew where north was still.
I cant say if all phones are like the one I tested but it had a hall sensor.
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