I sent Sprint a request to tether my phone to the PC. Here is the respose and instructions:.

Be Your Own Hot Spot
Sprint Ambassador Update

Your Sprint PowerVision phone is now equipped to provide a high-speed
wireless internet connection to your computer. You can send and receive
email, browse the Internet, and access your company's network anywhere
on the Sprint Power Vision Network with DSL-like speeds (300-800 Kbps).
This service has now been applied to your phone and is ready for use!

How-to:
1. Go to www.sprint.com/downloads to download and install the Sprint PCS
Connection Manager for your specific operating system (compatible with
Windows 2000 and XP).
2. Connect your phone to your PC using the USB cable.
3. Launch the Sprint PCS Connection Manager software, select a profile,
and click Connect.
4. Once the connection is established, you should be ready to do
anything you would do using a traditional data connection.

Reminder:
For technical issues, please contact Customer Solutions at (888)
296-8806.

(Please note: The phone as modem feature is not compatible with Mac OS
at this time).