@Emjem
If you're on a big bundle your balance will be taken automatically, however, if on a rolling plan, renewals can only come from your registered card.
Pay As You Go: Introducing "Rolling Plans"
https://www.o2.co.uk/help/pay-as-you-go/big-bundles
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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