Using my O2 free mobile data in Spain - do I turn data roaming on or will this charge?

It's now free to text and call and use mobile data in Europe and I'm on contract with O2 and have unlimited everything. I'm just wondering if on my iPhone I have to turn data roaming on to get this or will this charge me? How does it work? As when I turn on my mobile data without data roaming the 3G doesn't work until I actually turn on data roaming?

You have to switch on data roaming because, as the name suggests, when you are abroad it 'roams' the airwaves looking for a mobile signal that connects with O2 If you are in Spain you will see O2 ES come up on your screen which means you are connected to the Spanish network, ES is short for Espana. You won't get charged, but you will have a much smaller data allowance before they start charging you.

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