As others have said you can use a wireless router which is how my lap top is connected. When I am not home though I have my cell phone hooked up as a modem. I attach it to my pc, and the software connects to the internet through my phone. Anywhere my phone has a signal anyway.. It was really slow but for someone like me a little is better than nothin at all!

The wireless router cost me about $120 I think. The hardware for the cell phone to connect cost me 50 dollars for the hookups and then $30 dollars a month. But you can cancel it when you don't need it and then if your going somewhere subscribe to it again a few days before your trip.