12-09-2018 02:40 PM
You may. Your UK allowances are usable there with up to 15GB / month data if you have more. Any out-of-allowance charges will be as in https://ee.co.uk/help/add-ons-benefits-and-plans/call-or-going-abroad/roaming-costs/countries/poland .
If you are on contract, remember to text ROAMING to 150 before you leave home to check that you have roaming enabled on your a/c.