The IMEI was not being properly displayed in the UI; the code would load it
reading 'EquipmentIdentifier' from ModemManager, but the UI wasn't getting
refreshed properly when that happened. So at the end, the IMEI was stored but
not shown. This patch fixes the issue, by reloading the UI element when the IMEI
is retrieved.
The same issue was happening with the Operator Code, with the additional issue
being that this property is meant to change whenever the registration info in
the modem changes. Therefore, we now listen to the 'RegistrationInfo' signal to
detect the changes and update the Operator Name when that happens.
https://bugzilla.gnome.org/show_bug.cgi?id=688211
You have to pass the NMDevice to nm_client_activate_connection() for a
device-specific connection. This got broken at some point in the
rewrites since 3.4.
https://bugzilla.gnome.org/show_bug.cgi?id=682469
