@Mahs : Yes, you need to prefix the no. with the US country code, +1. It might be chargeable depending on the plan you are on.
As it is not in EU, if you are on contract, you may use your usual UK allowances there with up to 50 GB data per billing month if you have more, when you buy for £11.40 / month or have already as a Smart Benefit the Roam Abroad Pass or you have an EE Max Plan. Otherwise you will need to pay the charges or buy roaming add-ons as set out in https://ee.co.uk/help/help-new/roaming-costs/countries/usa.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Mobile Phone & Mobile Broadband or Option 2 for Home Broadband & Home Phone
ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
