HT202831: How iOS decides which wireless network to auto-join
Learn about How iOS decides which wireless network to auto-join
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Helpful answers
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Jul 7, 2015 5:54 PM in response to cgotogiby Lawrence Finch,If it is an unsecured network that requires signing it, it detects this by attempting to open a test URL owned by Apple. If it is a secured network instead of the Apple site you will see the login screen for the site. If it detects the Apple site it will assume it is unsecured. But it remembers this status. So the next time you log in to the unsecured site it will not do the test. If the site requires login again you will have to open Safari and go to any site; this will force the router to display the login screen.