One of the ways I keep myself connected at the courthouse, or anywhere else, is with an application called PdaNet. This is one of my favorite applications.
The application comes in two forms: free and paid. The free version allows you to access non-secure (non-HTTPS) sites, while the paid version allows free roaming of the internet. You can purchase the full version from the designer's site.
The process is called "tethering." This means that you use your phone's mobile connection to access the internet, and create a bridge between your laptop and your phone.
It's fairly easy to set up the link:
When the installation finishes, you'll use the PdaNet application on your phone and your computer to connect. You may need to enable USB Debugging: Click Menu > Click Settings > Click Applications > Click Development > Make sure the check mark beside "USB Debugging" is checked.
You will find slower connection speeds on your laptop than when you use a WiFi or ethernet connection. This is one of the disadvantages to the tethered connection.
However, in my opinion, if you're in a pinch, this is an excellent solution. In fact, I once ran an entire 6 hour deposition from my laptop with a connection to my office computer. No problems.