Just seen this https://www.o2.co.uk/shop/sim-cards/pay-as-you-go/ might be some help to some one
To get 50% extra data on top of your standard Big Bundle tariff allowance for two months you will be entitled to 50% extra UK data on top of your standard data allowance as follows:
£10 Big Bundle= 250MB extra in addition to 500MB standard; £15 Big Bundle = 500MB extra in addition to 1GB standard; £20 Big Bundle = 1GB extra in addition to 2GB standard; or £25 Big Bundle = 2GB extra in addition to 4GB standard (each an “Extra Allowance”).
If you are a New Customer you will receive the Extra Allowance automatically when you top up. If you are an Existing Customer or a Switching Customer you will need to: opt into the Promotion by texting “BIG50” to “2424” prior to the expiry of the Promotion Period; and renew your Big Bundle within 30 days of opting in.
http://www.o2.co.uk/termsandconditions/rewards/big-bundles-50-percent-extra-data-offer-terms-and-con...
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