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Viersen, Germany - June 9. 2021: Closeup of O2 3,5 gb allnet flat prepaid phone card in shelf of german supermarket (focus on big number 3 Stock Photo - Alamy
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UK's Virgin Mobile and O2 Network Users Won't Face EU Roaming Charges When Traveling Abroad | MacRumors Forums
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O2 scraps roaming fees (including data) to 47 countries - but careful because 5 are only included for some - Mirror Online
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O2 Celebrates Being The 'Odd One Out' With Tactical Advert As It Becomes The Only Major UK Network To Rule Out Roaming Charges In Europe – Marketing Communication News
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