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When on wifi with my Macbook, sometimes I plug my phone in via USB and both connections say they are working. How do I know which connection my Macbook is using? Further, how do I force my Macbook to prefer the wifi connection?

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I'm running Mountain Lion 10.8.4 on a Macbook Air Mid 2011, and iOS 6.0 on an iPhone 5.

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The preferred connection is shown at the top of your list. This doesn't mean that the iPhone USB connection will never be used; but, it makes it less likely.

You can control which connection will get precedence with the gear icon at the bottom of the list window you showed, and select "Set Service Order".

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