I used this link to get my PC5750 air card working. I do not use VZAccess Manager and don't want to.
A Newbie's Checklist - Installing PC5750 modem on 11.1 - openSUSE Forums
I'm not sure that the help at the link applies in your case, but it could get you started in the right direction. I found the page Googling "opensuse pc5750." You might consider trying something similar for your specific configuration.
The 11.2 Network Manager may be able to use the air card to access the Internet after adding it to the "mobile broadband" tab using the guidance at the above, which I think was for a previous version.
Mine works great!
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