On other interesting point is that settings for the mobile data context
are a bit odd in that the gateway and address returned from the operator
are both the same:

Interface=ccmni0 DomainNameServers=149.254.230.7,149.254.192.126,
Gateway=10.129.20.112 Address=10.129.20.112 Netmask=255.255.255.0
Method=static

This doesn't appear to cause problems when the mobile data connection is
initially configured, however for some reason when WiFi is disabled it
is causing an issue.

On initial configuration, we setup up the route for mobile data and then
set it as default.

When WiFi connection, we setup a route for WiFi, then make it the
default route ( ie. we don't remove the mobile data route ).

When WiFi is again disabled, we remove the WiFi route, and attempt to
set the mobile data route as the default again.  It's during this logic
that the failure occurs.

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https://bugs.launchpad.net/bugs/1378416

Title:
  turned off wifi to test 3g I see H in the indicator but I recieve
  nothing from the system

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