The US phone is no different than the UK phone. They come from the same factory and for that count so do the ones that go to Spain and France and so forth. I would not be worried but like ifonebone says "I do not know this first hand".
your other option could be to purchase a iPhone from the internet. This will allow you to bypass the plan. Althou prices to vary. And for the email, click on user cp at the top of the screen! It will allow u to change your settings.
User CP> List Subscriptions - delete them all if you wish.
To stop them subscribing you automatically go to:
User CP>Edit Options>Scroll down to "Messaging & Notification">Then where it says "Default Thread Subscription Mode" - change it to what you would like.
I have mine as to do not subscribe, if there's a thread I want to subscribe to I can do it manually.