This week I finally switch my cell phone over to Verizon Wireless. Through them you get two different speeds of internet, one which is slow but free, and the other which is high speed but may cost you depending on your plan.
With a powered phone to usb cable you can easily get on the internet from anywhere and it doesn't drain your phones battery either. This works very well and I recommend it to anyone who is looking to use the internet in their bus.
In case your wondering I am using a LG VX6000 hooked up to an Apple PowerBook G4