Unable to disable more than one Mobile Broadband device

[TJ]

On 13.04 with two mobile broadband devices disabling Mobile Broadband only disables the first device. The first device is an internal min-PCIe device, the second an external USB 'dongle'.

Both devices use the same connection APN info so disabling a connection is not a workaround.

As the external device is presenting as two USB serial interfaces other processes cannot access the serial ports whilst Network Manager has them open.

There needs to be an option to disable individual devices where there is more than one since the first device may be the primary WAN connection, so disabling all Mobile Broadband would not be desired.