@Denholm
Short answer is yes.
How much depends on tariff.
All you need is in this guide Guide: Roaming MegaGuide
Try to use WhatsApp over wifi where possible or get a local sim for data use.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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