No, it's only applicable to EU, US, Canada, Mexico, NZ & Oz.
As it is not in EU, you cannot use your usual UK allowances there but 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/stlucia.
If you are on contract, remember to text ROAMING to 150 before you leave UK to ensure roaming is enabled on your account.
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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
