Let me preface this by saying, I think if a person buys 2GB of data/internet from a wireless carrier, they should be able to use it however they want. Whether it's on their phone or laptop.
I read an article recently that said Verizon is going to start crackdown on tethering like AT&T has. AT&T adds $45 a month to your bill for tethering. U.S. wireless carriers consider it a theft of service and a violation of your contract.
I think it's bogus that you can't use your 2GB of data/internet however you want, but just keep that in mind. They could charge you for it and cancel your contract.