Which carrier are you using the TRo 650 with. Do you have a data plan?

Here are the steps:

1. In the Treo 650's Prefs, Bluetooth, the most important option you need to activate is "Dial-up Networking". When it's on, you should see a small computer icon at the upper right of your screen, instead of the usual blue bluetooth icon. If you don't have this option, you need to update to the latest Treo 650 firmware.

2. Now you need to add the Treo 650 to the 770. To do this, click on the phone icon at the top and select Change Phone. On the new window, select Add, and it should detect you Treo 650. Pair them.

3. Now go to the Nokia 770's Control Panel, and on it's menu, select Tools->Mobile operator setup wizard. Select your country and your carrier.

4. Now, try to connect by clicking on the world icon at the top. Select Connect. You should see a 'P' icon that is lablled with your carrier (from step 3). Select that row and it should connect.

Let me know if it works.