O2 have a fair usage policy when abroad ie
Using our services in our Europe Zone for more than 63 days in any four month period is what we consider to be unfair use. If you do this, we’ll send you a fair usage notification by text. If you continue to use these services after we’ve notified you, we’ll apply surcharges for further usage that we recognise as over usage.
These surcharges are £3.60 per GB for data, 3.3p per minute for calls and 1p per text. The surcharges will appear on your next months bill. We’ll stop applying surcharges to your European Zone usage once the majority of your usage over the previous four months has been in the UK.
At some point O2 will catch up with you and start charging more or turn your service off.
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