I rebooted the device, it established a data connection (H symbol in the indicator) then after less than 5 minutes it disconnected
$ nmcli d DEVICE TYPE STATE CONNECTION ril_0 gsm disconnected -- ril_1 gsm unavailable -- ifb0 ifb unmanaged -- ifb1 ifb unmanaged -- lo loopback unmanaged -- ip6tnl0 unknown unmanaged -- sit0 unknown unmanaged -- tunl0 unknown unmanaged -- ccmni0 wifi unmanaged -- ccmni1 wifi unmanaged -- ccmni2 wifi unmanaged --
I rebooted the device, it established a data connection (H symbol in the indicator) then after less than 5 minutes it disconnected
$ nmcli d
DEVICE TYPE STATE CONNECTION
ril_0 gsm disconnected --
ril_1 gsm unavailable --
ifb0 ifb unmanaged --
ifb1 ifb unmanaged --
lo loopback unmanaged --
ip6tnl0 unknown unmanaged --
sit0 unknown unmanaged --
tunl0 unknown unmanaged --
ccmni0 wifi unmanaged --
ccmni1 wifi unmanaged --
ccmni2 wifi unmanaged --