For Mexico, yes, 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.
As to others, you cannot use your usual UK allowances there but will need to pay the charges or buy roaming add-ons as set out under https://ee.co.uk/help/help-new/roaming-costs/ .
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
