I have the same problem, the modem is detected by the NetworkManager, I
can connect and I get an IP address, DNS servers but no default GW.

Using the ZTE k3806-z modem I get this network configuration from
NetworkManager:


eth0      Link encap:Ethernet  HWaddr 00:1e:c2:10:82:e4  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

eth2      Link encap:Ethernet  HWaddr 00:1e:c2:a4:16:b7  
          inet6 addr: fe80::21e:c2ff:fea4:16b7/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:376 errors:0 dropped:0 overruns:0 frame:4041
          TX packets:441 errors:22 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:226080 (226.0 KB)  TX bytes:55004 (55.0 KB)
          Interrupt:16 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1742 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1742 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:147360 (147.3 KB)  TX bytes:147360 (147.3 KB)

usb0      Link encap:Ethernet  HWaddr 02:40:a0:dd:95:7b  
          inet addr:46.189.185.73  Bcast:46.189.185.73  Mask:255.255.255.255
          inet6 addr: fe80::40:a0ff:fedd:957b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:44 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:8327 (8.3 KB)

luisdavim@davim-s-MacBook:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 usb0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 usb0

Using an Huawei E156G modem with the same SIM card I get this:


eth0      Link encap:Ethernet  HWaddr 00:1e:c2:10:82:e4  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:17 

eth2      Link encap:Ethernet  HWaddr 00:1e:c2:a4:16:b7  
          inet6 addr: fe80::21e:c2ff:fea4:16b7/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:376 errors:0 dropped:0 overruns:0 frame:4045
          TX packets:441 errors:25 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:226080 (226.0 KB)  TX bytes:55004 (55.0 KB)
          Interrupt:16 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3166 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3166 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:261824 (261.8 KB)  TX bytes:261824 (261.8 KB)

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:78.137.225.237  P-t-P:10.64.64.64  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:964 errors:0 dropped:0 overruns:0 frame:0
          TX packets:998 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3 
          RX bytes:756991 (756.9 KB)  TX bytes:124404 (124.4 KB)

luisdavim@davim-s-MacBook:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.64.64.64     0.0.0.0         UG    0      0        0 ppp0
10.64.64.64     0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 ppp0

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https://bugs.launchpad.net/bugs/861282

Title:
  19d2:1015 ZTE K3806-Z network connection established, but does not
  work

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