Remember, if someone calls you claiming to be from O2, we would never ask for one-time passcodes, passwords and PINs, or personal information like your bank details. So, make sure you check who they are by asking where they're calling from. If you have any doubts, just give us a call on 202 (free from your O2 mobile) or on 0344 809 0202 (standard UK rates apply) to check. These could be nuisance calls, so see our advice on what to do about them.

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