@s2sap £10 is the minimum top up but will do two months of the £5 plan.
You can't change your plan yourself for 30 days, but if you call 4445, customer service may be able to do it for you.
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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