ZTE LTE modem model MF821

Doesn't look like you need drivers.
Do you have usb_modeswitch and usb_modeswitch-data packages installed.

Quite a few hits at opensuse forums for configuring usb modems

http://forums.opensuse.org/forum.php

And many more found through search engine.

If none of those help maybe posting your question on opensuse forums with output of lsusb and any other info that you might think would be helpful might be more productive.

Else wait for someone more knowledgeable than me to come along.