@Daiprit
Depends on your phone and tariff which no one here can possibly know.
See help.
USA - Roaming with O2
Guide: Roaming MegaGuide
https://www.o2.co.uk/international/using-your-phone-abroad
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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