Location services let a mobile device work out where it is, which powers maps, navigation, weather, find-my-device features, photo tagging and emergency calls. For A+ you should know how each positioning method works, its strengths and weaknesses, why a phone combines several of them, and how to control location access for privacy and battery life. Most support calls in this area are either 'my map shows the wrong place' or 'why does this app know where I am', and both are answered by understanding the methods and the permissions.
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