Try the following actions:
- Verify that your mobile network connection and your Wi-Fi connection are both turned on.
- Verify that your BlackBerry smartphone is connected to the mobile network by checking that the indicator appears in the connections area at the top of the home screen.
- Verify that your wireless service plan is set up to use Mobile Hotspot mode. For more information, contact your wireless service provider.
- If you are roaming, on the Mobile Network Options screen, verify that the Data Services field and the While Roaming field are set to On.