They're all in http://ee.co.uk/help/add-ons-benefits-and-plans/call-or-going-abroad/roaming-costs/countries/usa .
If you have an EE max plan taken out after the 10th May, then roaming is free (subject to fair use) so no charges apply.
Have a great time.
Welcome to the community. 🙂
I see you have been given some brilliant information already.
Please make sure you text ROAMING to 150 to make sure your phone is fully set up.
Find out more about roaming >
Have a fantastic time. 🙂
One of these options may help you find the answers you need.
Start a topic
Join the EE Community to ask, answer, learn and share.