Hi,
It looks like your EG25-G modem is connecting to Verizon but is only getting an IPv6 address, which suggests a configuration issue rather than a network or SIM problem. Here are a few things you can try to get an IPv4 address assigned:
Check and Set the Correct PDP Type
Verizon’s vzwinternet APN typically supports both IPv4 and IPv6, but sometimes the modem defaults to IPv6-only. You can check your current PDP context settings with:
AT+CGDCONT?
If you see IPV6 or IPV4V6 for vzwinternet, change it to IP (IPv4-only) using:
AT+CGDCONT=1,"IP","vzwinternet"
Reboot the modem after making this change.
Manually Force IPv4 Using QMI
If you’re using the QMI interface, try forcing the modem to request an IPv4 address:
sudo qmicli -d /dev/cdc-wdm0 --wds-set-ip-family ipv4
sudo qmicli -d /dev/cdc-wdm0 --wds-start-network="apn=vzwinternet,ip-type=4" --client-no-release-cid
This should ensure that the network assigns an IPv4 address.
Restart ModemManager and Reconnect
The error “interface-in-use-config-match” suggests that ModemManager is holding onto a conflicting configuration. Try resetting the modem and reconnecting:
sudo mmcli -m 3 --simple-disconnect
sudo mmcli -m 3 -r
sleep 5
sudo mmcli -m 3 --simple-connect="apn=vzwinternet,ip-type=ipv4"
If that fails, restart ModemManager completely:
sudo systemctl restart ModemManager
Check Verizon’s IMEI Restrictions
If this SIM card worked in a different modem but isn’t getting IPv4 on the EG25-G, Verizon might have restrictions based on the modem’s IMEI. Some carriers require a specific IMEI to be whitelisted for full IPv4 support. You might need to check with Verizon to confirm if this modem is fully activated on their network.
Try setting the PDP type to IPv4 first, then test with qmicli or nmcli. If the problem persists, it could be a Verizon-side IMEI restriction. Let me know if you need more help!