Back in college I did exactly this. It was 2004, I couldn't afford a data plan, but my school had a dialup service for resnet and I had free nights+weekends on

Back in college I did exactly this. It was 2004, I couldn't afford a data plan, but my school had a dialup service for resnet and I had free nights+weekends on my cell phone. I spent a lot of family RV trips in the passenger seat with my laptop using my cell phone as an analog modem over Bluetooth, getting free internet access at 9600 bits per second (nominally, slower in reality) browsing with images disabled because otherwise it was just unusable.