During the initialization, only EAP over LAN (EAPOL) 802.1x traffic is allowed between the client and the Wi-Fi access point. All other traffic like DHCP or HTTP is blocked.
SIM Authentication, also known as EAP-SIM/AKA, is all about a seamless and secure user experience. Users are automatically connected to an encrypted 802.1x Wi-Fi network.
SEAMLESS SIM AUTHENTICATION FOR MOBILE
Key to a successful mobile data offloading strategy is ease of use with a seamless and secure user experience. SIM-based authentication is a powerful tool for achieving these goals. This is the method whereby mobile/cellular devices that have a SIM card use the same SIM card to authenticate the device for the Wi-Fi service. Users will just securely fly on to the Wi-Fi network.