I read this in the instruction booklet:
Mobile Network Sharing
Your device's data capabilities as a modem for your laptop computer. You can send and receive email and browse the Internet anywhere on the Nationwide Sprint Network.
Important:You need to install HTC Sync(pg45) before you can use mobile network sharing.
1. Make sure your device's data connection is turned on. See Getting Started with Data Services to learn how to turn on the device's data connection.
2. Connect the device to the computer using the provided USB cable.
3. Press the home key>menu>and tap Settings>Wireless controls.
4. Select the Mobile network sharing check box.
Note:When using mobile network sharing, the USB mass storage feature is disabled. Also, you will not be able to use HTC Sync.
Also listed on
HTC Hero Forum - phone as modem