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Also depends if you are PAYG or PayMonthly/Contract, @Joneslin -
Above for Contract, and requires a bolt on called O2 Travel that is free but which will cost £6 for any day that you use it, @Joneslin - and if you are PAYG, then you pay standard call charges as below:
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. Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.