@pungler
From the T&C's......
- Data rollover is available on £10, £15, £20 and £30 data Big Bundles only. On your monthly renewal date you can carry forward up to 100% of your standard monthly data allowance (“Roll Over Data”) into the following month’s data bundle, subject to your total data bundle (Roll Over Data + standard monthly allowance) not exceeding 200% of your standard monthly data allowance at any one time. Any data that cannot be rolled over will expire. Roll Over Data will expire immediately if you fail to renew your Big Bundle on time or if you change tariffs.
https://www.o2.co.uk/termsandconditions/mobile/big-bundles-terms-and-conditions
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