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How to program to show the GPS availability and Accuracy level in an iphone? and it has to wipe the previous lat, lon info in label.
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There is a class in iOS sdk called CLLocationManager. Go though its documentation in the XCode or look for some sample example.
http://mobileorchard.com/hello-there-a-corelocation-tutorial/
CLLocationManager has a method
locationServicesEnabledto check if the service is enabled or not