Your phone is acting as a wireless hotspot with built-in NAT functionality. It receives a UDP packet from the WiFi network and routes it to the 5G network. Which fields in the packet are not modified by the phone?

Explanation: The WiFi network created by your hotspot is the internal network, and the cellular 5G network is the external network. A NAT processing outgoing traffic will replace the source port and source IP with values from the NAT table, and all routers replace the source and destination MACs.