They can use multiple systems at the same time. More satellites result in a more accurate position, primarily when you move around and object close to you can block the signal from some of the satellites.
[https://play.google.com/store/search?q=gps%20test&c=apps&hl=en](https://play.google.com/store/search?q=gps%20test&c=apps&hl=en) is and androd app that can show the satellites in view that the pone will use
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