I read a post a few weeks about someone using the IOgear GWU627 with their OBI110. I have wanted a device like that for a while just in case my DSL goes out. I ordered it and it just came it. Here is a pic of a test setup.
In the pic is my cell phone that is being used as a wireless hotspot. The IOGear GWU627 is taking that wireless connection and bridging it to a wired Ethernet port with NAT and DHCP. I have a 5 port switch connected to the IOGear box and 2 laptops and a OBI110 connected to the switch. I can make calls and browse the web on the laptops. Cool stuff!!!