Instructions
Set Up Hotspot
Touch "Applications" on your Ally and then press "3G Mobile Hotspot."
Tap the box next to "3G Mobile Hotspot" so a check mark appears. Touch "Continue."
Touch "Turn on Mobile Hotspot" and then touch "Configure."
Type in an SSID to identify your network and then choose "WPA2-PSK" from the drop-down menu. Type in a password for your network. Tap "Save."
Connect the Xbox
Click "Settings" and then "System" on your console menu.
Click "Network Settings." Scroll to the network name you created with your Ally and then press "A."
Type in your password with the on-screen keyboard. Click "Done" when you're finished. If you're prompted to update that Xbox software, click "Yes" to update. If the update is large, you may have to wait awhile for it to finish.