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One device per session and private Wi-Fi addresses
Every voucher, QR pass, purchase or free login is locked to the first device that uses it. Another phone is refused - even while the first phone is switched off - until an admin presses Release device (voucher details, Guest Check-in, or the phone icon in Guests).
Private / rotating Wi-Fi addresses
iPhones (iOS 18+) change their private address every 2 weeks on open networks; some Androids change it after 24 hours. WiFiNexa gives the phone's browser a secret device key at the first login. When the address changes, the same phone is recognised and reconnected automatically - up to 3 times a day (Settings → Site). Other phones never get that key.
Best practice: protect the guest Wi-Fi with a simple password (WPA2). iPhones then keep a fixed private address. The check-in QR joins the network with the password automatically.