GL-MT3000 and HUAWEI E3372

Technical Support for Routers 4G LTE, 5G NR, USB modems
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Here: ^HCSQ:"LTE",77,67,121,20

I also found out that if I create the network profile directly in Luci, it's much easier and faster to re-establish the modem connection in GL-iNet UI:

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Another benefit of setting this up in Luci is that the E3372 connects to the Internet automatically when I plug it to the MT3000 (without going to the UI and click Auto Setup).

For auto re-connection, I use this script: openvpnForNordvpn/etc/init.d at master · oilervoss/openvpnForNordvpn · GitHub