I just tried that here with a ZTE MF112 3G modem.
I plugged it in and Mobile Broadband appeared in the Network indicator dropdown. I then added the connection as you described.
When completing the wizard part the drop down is indeed blank, but dropping that down showed me my connection.
I just tried that here with a ZTE MF112 3G modem.
I plugged it in and Mobile Broadband appeared in the Network indicator dropdown. I then added the connection as you described.
When completing the wizard part the drop down is indeed blank, but dropping that down showed me my connection.