Huawei E3276 Telia Ubuntu Desktop 12.04 funkar inte

echo -e "AT^NDISDUP=1,1,\"online.telia.se\"\r" > /dev/ttyUSB0
dhclient wwan0

Assuming you have configured usb modeswitch beforehand with:

echo "12d1 1506" > /sys/bus/usb-serial/drivers/option1/new_id

Works with telia in Sweden.

Bjorn will push this into the linux main branch soon, but if you are eager to hack, you can update drivers/net/usb/cdc_ncm.c with this:

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 4cd582a..74fab1a 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -540,10 +540,12 @@ advance:
      (ctx->ether_desc == NULL) || (ctx->control != intf))
   goto error;

-    /* claim interfaces, if any */
-    temp = usb_driver_claim_interface(driver, ctx->data, dev);
-    if (temp)
-     goto error;
+    /* claim data interface, if different from control */
+    if (ctx->data != ctx->control) {
+     temp = usb_driver_claim_interface(driver, ctx->data, dev);
+     if (temp)
+     goto error;
+    }

  iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;

@@ -623,6 +625,10 @@ static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)

  tasklet_kill(&ctx->bh);

+    /* handle devices with combined control and data interface */
+    if (ctx->control == ctx->data)
+     ctx->data = NULL;
+
  /* disconnect master --> disconnect slave */
  if (intf == ctx->control && ctx->data) {
   usb_set_intfdata(ctx->data, NULL);
@@ -1245,6 +1251,14 @@ static const struct usb_device_id cdc_devs[] = {
    .driver_info = (unsigned long) &wwan_info,
  },

+    /* Huawei NCM devices disguised as vendor specific */
+    { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16),
+     .driver_info = (unsigned long)&wwan_info,
+    },
+    { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46),
+     .driver_info = (unsigned long)&wwan_info,
+    },
+
  /* Generic CDC-NCM devices */
  { USB_INTERFACE_INFO(USB_CLASS_COMM,
   USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),

sudo usb_modeswitch -v 0x12d1 -p 0x1c1b -M "55534243000000000000000000000011062000000100000000000000000000"