APN stands for Access Point Name and are the settings your 5G Xtream needs to pass to the network carrier; AT&T, Vodafone, T-Mobile, etc. in order for the carrier to allocate your 5GXtream an IP address and connect you to the right secure network. With the 5G Xtream, it has a “Auto-APN” feature that reads the SIM details and selects the correct APN settings for the SIM’s mobile network.