Modem connected but no internet

[Lucas Pelegrino]

Hello there.

I have this behavior in my raspberry PI where a modem shows connected, but
I still can't connect to the internet:
--------------------------------
General | path: /org/freedesktop/ModemManager1/Modem/4
| device id: ab1573a4186ee4930c3dbe7ee14e2dddcd10b4c2
--------------------------------
Hardware | manufacturer: huawei
| model: E3276
| firmware revision: 21.260.05.01.150
| supported: gsm-umts
| current: gsm-umts
| equipment id: 866519011156587
--------------------------------
System | device:
/sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.2
| drivers: huawei_cdc_ncm, option
| plugin: huawei
| primary port: cdc-wdm0
| ports: cdc-wdm0 (at), ttyUSB0 (at), ttyUSB1 (at), wwan0 (net)
--------------------------------
Numbers | own: +xxxx
--------------------------------
Status | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2
(10)
| state: connected
| power state: on
| access tech: umts
| signal quality: 41% (recent)
--------------------------------
Modes | supported: allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 2g, 3g, 4g; preferred: none
| current: allowed: 2g, 3g, 4g; preferred: none
--------------------------------
IP | supported: ipv4, ipv6, ipv4v6
--------------------------------
3GPP | imei: 866519011156587
| operator id: 72416
| operator name: Oi
| registration: roaming
--------------------------------
3GPP EPS | ue mode of operation: csps-2
--------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/4
--------------------------------
Bearer | paths: /org/freedesktop/ModemManager1/Bearer/5



Weird thing is that on my Ubuntu desktop this modem works! The only
difference I noticed is that in my Ubuntu field 'access tech' is 'lte',
while above (on the pi) like you can see it's 'umts'.

I figured the problem might be related to the 'access tech' field above, so
I tried forcing setting mode for '4g' but didn't work:

*$ sudo mmcli -m 4 --set-allowed-modes='4g' --set-preferred-mode='4g'*
error: couldn't set current modes:
'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unsupported: The
given combination of allowed and preferred modes is not supported'


The only difference between my raspberry pi and my desktop machine is that
the pi is under a more recent version of ModemManager 1.16 vs 1.12 from my
desktop Ubuntu.

Any ideas?
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