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I use QR codes for this, they work for both android and iOS. This link explains how they are formatted: https://qifi.org https://qifi.org

• captn3m0 3y ago
  An NFC tag with the same contents as WiFi connection strings also work.
• maratc 3y ago
  I use QR codes too. Otoh NFC tags only work on Android, I haven’t managed to get them to work on iPhones yet.