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If you have a Cingular cell phone with Bluetooth, you can use it as a modem to allow the Nokia 770 to get online. If you have EDGE connectivity, do the following:
Go to Apps/Tools/Connection Manager
In the Connection Manager Menu, select Tools/Connectivity
Press "Connections"
Either create a New Connection or edit your current "Cingular Internet" connection. Using "Packet data", click Next. Type the following settings:
Access point name: wap.cingular
Dial-up number: *99#
User name: WAP.CINGULARGPRS.COM
Password: CINGULAR1
That's it. Click Finish. Warning: you might want to get the $20 unlimited data plan offered by Cingular, as they charge $.01/KB of data. Also, tethering this device might be in violation of your service agreement, although the Cingular rep at the store I purchased the plan from said this was fine.