The use case: You have 3G mobile data connection on your Windows Phone, how do you share this with your other device which are wifi enable?
MakeUseOf have revealed it is build into the Mango release of Windows Phone 7.5. Yet it was released with little fanfare.
1. Make sure that Data Connection and 3G Connection is enabled in Settings
2. Slide to enable Sharing and specify a name so that other devices can discover your phone’s connection.
3. Go to your device and find this SSID name, key in the password and you should be connected.