I've been trying to get my Treo 650 from Verizon to work as a DUN client with my Mac for the last few weeks. After visiting numerous forums and following numerous people's advice, I actually found a solution that works!! Follow this thread at everythingtreo.com forum or simply follow the instructions that I have posted. You will not be surfing at High Speed, but when your on the road who cares!

Part A: Treo hack (Verizon)
1. Download Shadowmite's hacked BtManager.prc to my Mac.
1(b)- because of funny settings from the web server, rename downloaded file from BtManager.verizon.prc.txt to BtManager.verizon.prc.
2. Soft reset the Treo 650, for a clean start.
3. Disable any programs that use the network connection, e.g. Chattermail.
4. Drag-and-drop BtManager.verizon.prc onto Bluetooth File Exchange.
4(b) send file to the Treo.
4(c) accept the file and agree to replace the existing app.
5. Open the new Bluetooth application on the Treo
5(b) Turn on Bluetooth DUN, accept the warnings.

Part B: Mac Setup
1. Open Bluetooth preference pane.
1(b) in Devices pane, delete the existing connection to the Treo.
2.Click 'Set up new device...'
2(b) Choose 'mobile phone'
2(c) Select the Treo
2(d) Enter the pairing password
2(e) Select Access The Internet service.
2(f) Enter the network settings:

Username: YourNumberHere@vzw3g.com, where the digits are my cellular number
Password: vzw
Phone Number: #777
modem Script: 1_VZW_Generic_1X_ON_230400 (you can find that here)

3. Set up network port: Click on 'Sharing' tab
[ this step may not be necesssary for other people ]
3(b) Click 'Add Serial Port Service'
3(c) Rename to 'BluetoothDUN' or the like
3(d) Set Type: Modem, and turn on 'Show in Network Preferences'

4. Network Preferences
4(a) Open Network preference pane
4(b) Click to configure BluetoothDUN
4(c) Under PPP, click PPP Options...
4(d) Turn ON PPP echo packets, and OFF TCP/IP header compression

Part C: Attempt to Dial
1. Open Internet Connect
1(b) Select BluetoothDUN
1(c) Click 'Connect'

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