How it Works This section describes the Wi-Fi to LTE handover, Wi-Fi handover with EPS fallback, and Wi-Fi to 5GS handover. EPC to Non-3GPP Untrusted Wi-Fi Handover Call FlowNon-3GPP Untrusted Wi-Fi to EPC Handover Call FlowNon-3GPP Untrusted Wi-Fi to 5GS Handover Call Flow5GS to Non-3GPP Untrusted Wi-Fi Handover Call FlowNon 3GPP Untrusted LTE to WiFi Handover