It should work without any problems and you can use your allowances whilst on a Greek network. Just be careful not to stray onto a Turkish network which could be a problem in some parts of the island.
https://www.o2.co.uk/help/pay-monthly/roaming-in-europe
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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