I have a manjaro installed on a Lenovo X240 with a 4G adapter:
Ericsson Business Mobile Networks BV N5321
From the upgrade to gnome 3.38 I don’t see this connection from the system menu but I can connect using modem-manager and also using the Network tab (Rete in my italian localization) from the Settings gnome program.
I remember the same problem in a previous upgrade but I cannot remember the solution and I cannot find anything in the forum.
This is the report from nmcli when connected
cdc-wdm2: collegato to TIM Maxxi Alice/Internet "cdc-wdm2" gsm (cdc_wdm, cdc_acm, cdc_mbim), hw, iface wwp0s20u4i6, mtu 1500 predefinito ip4 inet4 10.41.85.198/29 route4 10.41.85.192/29 route4 0.0.0.0/0