Bluetooth Tethering T-Mobile to Windows XP
...on their $25/month unlimited EDGE 'smartphone' plan...

I just quickly changed the settings to the right ones (for this plan) and reposted this guy's ( http://bill-micke.com/blog/2009/02/h...ckberry-curve/ ) instructions.

1. Click Start > Settings > Control Panel.
2. Double-click Phone and Modem Options.
3. In the Phone and Modem Options window, click the Modems tab.
4. Select Standard Modem and click Properties.
5. Click Change Settings.
6. In the Standard Modem Properties window, click the Advanced tab.
7. In the Extra initialization commands field, type the following:+cgdcont=1,”IP”,”<your Internet APN>”Note: The following is applicable for T-Mobile® customers only:

The extra initialization command is: +cgdcont=1,”IP”,”internet2.voicestream.com”

Note: If you do not know your Internet APN, or if you do not have an Internet APN, contact your service provider.
8. Click OK.
9. In the Phone and Modem Options window, click OK.

NEXT:

1. Click Start > Settings > Network Connections.
2. Double-click New Connection Wizard. The New Connection Wizard opens.
3. Click Next.
4. Select the Connect to the Internet option. Click Next.
5. Select Set up my connection manually. Click Next.
6. Select Connect using a dial-up modem. Click Next.
7. If the Select a Device screen appears, select the Modem - Standard Modem check box. Click Next.
8. In the ISP Name field, type a name for your connection. Click Next.
9. In the Phone number field, type *99***1#. Click Next.
10. Indicate which users will have access to the connection. Click Next.
11. Type the user name and password provided by your service provider. Click Next.
12. Click Finish.
13. In the Connect window, click Properties.
14. In the Properties window, verify that Modem - Standard Modem appears beneath the Connect using heading, and then click Configure.
15. In the Modem Configuration window, clear the Enable hardware flow control check box and make sure none of the other check boxes are selected. Click OK. In the Properties window, click OK. (NOTE: Many sites tell you to leave this checked. They are wrong! Un-check the flow control box and leave it empty)