@Suzanna63 are you on contract or pay-as-you-go? If on pay-as-you-go you need credit on your account and you need purchase a data bundle that you can use loss in USA, if your on contract did you enable roaming on your EE account before you left the UK ?
To contact EE Customer Services dial 150 From your EE mobile or 0800 956 6000 from any other phone.
