You should now be able to connect to your server from the internet. Have a friend, or someone outside your LAN, confirm that they can connect. I do not see why a 3g card would be an issue as long as your connection is outside the LAN the eqemu server is running on.
If not, it must be ports that are not forwarded properly. Port 9000, and all zone ports (viewable in the database) must be forwarded.
Can you confirm this works?
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