@Ram18
If you have Travel Inclusive Ultimate, yes.
If you just have O2 Travel. it will cost £6.oo per day.
If neither, very expensive https://www.o2.co.uk/international/using-your-phone-abroad
A local sim or a WorldSim may work out cheaper for you.
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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