The clever peeps at Apple have announced that the new iOS update will come with a Wi-Fi-network-sharing feature.
Simply hold two devices with iOS 11 next to each other and try to join the network from your unconnected device.
Next, a window will appear asking the owners of the network for permission for a new device to join the network.
Hit 'yes' and violà, the new device will connect. No unnecessarily long password required!