@Molli
You won't be charged as your data won't work if you've run out.
Tariff changes don't update until your next bill is generated, but if you upgraded, it should be immediate.
Check with O2 Guide: How to find help & contact O2
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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