root@3d28800:~# mmcli -L

Found 1 modems:
        /org/freedesktop/ModemManager1/Modem/0 [Huawei Technologies Co., Ltd.] ME909u-521

root@3d28800:~# ifconfig usb0
usb0      Link encap:Ethernet  HWaddr 02:1E:10:1F:00:00
          inet addr:10.220.123.201  Bcast:10.220.123.203  Mask:255.255.255.252
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:54 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:644 (644.0 B)  TX bytes:7990 (7.8 KiB)

root@3d28800:~# ping -I usb0 google.com
PING google.com (216.58.204.46): 56 data bytes
64 bytes from 216.58.204.46: seq=0 ttl=45 time=1222.222 ms
64 bytes from 216.58.204.46: seq=1 ttl=45 time=571.947 ms
64 bytes from 216.58.204.46: seq=2 ttl=45 time=591.795 ms
64 bytes from 216.58.204.46: seq=3 ttl=45 time=562.201 ms
64 bytes from 216.58.204.46: seq=4 ttl=45 time=571.416 ms
^C
--- google.com ping statistics ---
6 packets transmitted, 5 packets received, 16% packet loss
round-trip min/avg/max = 562.201/703.916/1222.222 ms