Did you know that you can enable Wi-Fi Tethering on AT&T Lumia windows phones? All you need to do is follow these instructions.
First, install a Spanish keyboard via settings -> Keyboard -> Add keyboards -> Spanish (Spain). You will have a pear showing that an update is ready to be installed. Just postpone it.
Now, you will see internet sharing under the settings. Tap on it and try to turn it on. You will see an error to call 611.
Now, go back to Settings -> Language + Region and now set the Country / Region to United States. Reboot it. After your Lumia windows phone has done rebooting, just use your phone for 5-10 minutes. Then, go to settings -> Internet Sharing and try to turn it on.
You will now see no errors, and you can now tether it with your Wi-Fi devices. Do it at your own risk, because you might get a bill for it later from ATT.