To me this is equal parts magic and sorcery. At my house, someone with an iPhone tries to connect to my WiFi. I get a pop up on my own iPhone and can share my WiFi password with them automatically and they connect to my network.
In: Technology
Your phone knows the wifi key, theirs doesn’t. But you exist as a contact in their phone, so it uses the same technology as airdrop to contact your phone and present the question to you about sharing the pass code.
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