|You got to love US cell phone companies. They do this to try to prevent people from doing just what you are trying. They want you to pay for each connection. My guess is that they did it through your local GPO. I do not know the exact place to look off the top of my head but all of this is done through GPedit.msc. Its just like REGedit so be careful. In there you will find a place where you disable network controls. Set the property to disabled and you will get your network control back.|
If you are not sure how to do this then I would recommend GOOGLEing "How to setup an AD HOC network for *insert you provider here*" There is probably a blog out there that will show you how to hack their software with step by step instructions.
Personally, I do not know who you are with (Probably Verizon) but I recommend switching to T-Mobile (Unless you need service in the middle of the desert because Verizon does have the best coverage only because they bought just about every cell company out there) because T-Mobile phones are open and you can do stuff like this.