[JohnnyOnTheSpot]

PS3...pff...that thing stinks. I don't think this is a stupid question at all and it deserves some attention.

The 360 can't run internet through USB, only through the internet. There are multiple ways to get around it, however. For one, there are some generic ethernet Wifi connectors that will work for the 360; I know they sell a few at Best Buy. Once you find a compatible one, you can find it cheap online.

Second, and my personal favorite, is running your 360 through your laptop's wireless connection. I've been doing this flawlessly for around 2 years now and I've had no problems; all you have to do is bridge the connection from your wireless to your ethernet port, and run a cable to the 360.

Now HERE is where the phone comes in. I haven't tried it myself, but theoretically if you use the phone as a modem, you MIGHT be able to bridge the connection to your 360. To make a completely portable gaming system, look up the Adaptec gambridge, which will allow you the plug your 360 into any computer (laptops included) and play through the screen via an accompanied program. It works really well, too, even through standard USB as mine does. If you can't bridge the connection, you could always set up your phone to "send out" it's internet, acting as a quasi-wireless router, and pick it up that way. Hook the phone to your PC to charge and VOILA! You have internet gaming!