Looks like a good morning for Samsung users! Taking that diagnostic menu one step further has allowed folks to figure out how to tether their Samsung WP7 devices, in addition to (the less exciting) MAC ID address.

The hack is pretty straightforward, though it will hose your Zune-over-3G sync option (leaving Wi-Fi sync intact). Overall it sounds like a good solution, so long as you don't run over your cap (2GB for most on AT&T).

Registering may fail on the first attempt, but try a second time and it should succeed.

    1. Open your phone and dial “##634#” then press call. You’ll go into the Diagnosis Menu (going forward this icon appears in your programs so you don’t need to dal that again). This is just a phone dialer with a little icon and note on top.
    2. In diagnosis mode (phone dialer) dial “*#7284#” and a dialogue will pop up letting you change the settings from Zune to modem or “Modem, USB dialog.”. You want to go with “Modem, Tethered Call”. It will restart you phone after a few seconds. Once it restarts, connect to your PC over USB and drivers will be installed on your computer. Now go to your connections on your PC and you’ll see that a Samsung modem was added.
    3. On your PC you need to change the setting for the Samsung modem. If you set it to prompt for user name you’ll be able to put in the login info. This is all it is:

      number: *99***1#

      user name: WAP@CINGULARGPRS.COM

      password: CINGULAR1

      Source: Mobility Digest