Limited inteet connectivity when connected to WiFi and USB-HSPA/3G

My setup is as follows:

1. An old Billion 400G router, not connected to the inteet
2. A new D-Link USB-HSPA/3G inteet stick

I need to connect to the router via WiFi to be able to print (I have a Canon 217w connected to the router via WiFi), as well as the inteet stick for inteet connectivity.

However, when both are connected, Windows indicates that there is limited connectivity on both connections - in other words, it doesn't pick up inteet from the stick when the laptop is also connected to WiFi.

Not very clued up when it comes to networking, but I do know that DHCP is enabled. I have tried bridging the connections, but that results in a very slow inteet connection from the stick.

So my question is this: how do I maintain both connections, and retain a high-speed inteet connection?

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