While this seems great on paper, in real-life there is a question on whether a Nokia Lumia device will connect to an ad hoc network. Some are complaining that their Lumia model does not even recognize the network. Perhaps a non-Lumia Windows Phone 8 model, like the HTC 8X, will work.
If you're a Windows Phone 8 user, just drop us a note and let us know if the app worked for you. Make sure you let us know which Windows Phone 8 device you're rockin'. Certainly the idea of bypassing your carrier has some of you out there intrigued.
source: Tether-X , Reddit via WMPoweruser