Starting with iOS 11, Apple has implemented many automatic features related to initial system setup and account authorization. This also applies to Wi-Fi networks – you can now use one tap to connect new devices running iOS 11 (and newer) to your Wi-Fi.
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How to transfer a password to someone else’s iPhone or iPad “in one tap” without naming a Wi-Fi password
The user interface resembles the pairing process with AirPods. If you try to connect a nearby iPad or iPhone to Wi-Fi, a notification will be displayed on a device that is already on the network. For example, iPhone X is a device that is already on the network, and iPhone 11 is a gadget trying to connect to it.
iPhone 11 (trying to connect to Wi-Fi):
In this case, the password input window will be displayed on iPhone 11, and on the iPhone X – a message about the possibility of providing a password.
iPhone X (already on a Wi-Fi network, may give access):
Next with a single click on the button Share Password you can send the Wi-Fi password to the iPhone 11 and after a short delay the password field on the gadget will fill up and the device will be instantly connected to the network.
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Thus, users no longer have to look for a password on the router case or enter the code on someone else’s device. It is enough to tell the guest the name of the Wi-Fi network and confirm the connection on your device. The only condition is that the devices of the guest and the “owner” of the network must be unlocked and be nearby.