sudo mmcli -v -m 1 --set-primary-sim-slot=1
[09 ago 2026, 03:33:18] [Debug] ModemManager process found at ':1.211'
[09 ago 2026, 03:33:18] [Debug] Assuming '1' is the modem index
[09 ago 2026, 03:33:18] [Debug] Modem found at '/org/freedesktop/ModemManager1/Modem/1'successfully requested primary SIM switch in modem
https://lists.freedesktop.org/archives/modemmanager-devel/2021-April/00…