This is one of the most interesting features of iOS 11. Usually, when you want to connect to a new Wi-Fi network on your iPhone, you have to enter its password. In iOS 11, things are simpler. An iOS device that is connected to a Wi-Fi network can grant access to another device that wants to connect. So when you want to connect to a new Wi-Fi network, if there’s any iOS device nearby that is already connected to that network, it will receive a popup to grant you with access to that network, without requiring you to enter its password.
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