12-01-2019 18:28 - edited 12-01-2019 18:36
Yes you can use your tariff as if you were at home. See here
Take note about Ireland in the link.....
on 12-01-2019 18:35
Can I use my O2 tariff in Europe to ring mobiles and landlines and also mobile is registered in other countries e.g. Ireland
Yes, you can call any EU country from your allowances when you are actually romaing yourself, but not when in the UK.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)