Vodafone Mobile Broadband; connection not possible: error code: 635

Hi experts. I have downloaded the latest software from their site.
When I click the connect button this message appeared.
I tried reinstalling it but it couldn’t connect. I tried the firewall it isn’t affecting it. The connection is still impossible.
How do I fix this?

Vodafone Mobile Broadband
Mobile connection not possible.
-Set your current mobile device as the default device under the ‘Devices’ tab in the Advanced window
-Ensure that no other applications are using your mobile device and try again in a short while
-Delete the device under the ‘Devices’ tab in the Advanced window, add it back again, and then try connection
-If you see the ‘Account Type’ option in the Options window, check that the right account is selected for your SIM.
If this error persists, please contact Support at your mobile network operator.
Support information: RAS error code 635
