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The My O2 application has been updated to allow customers to add date bolt ons through the application after you have reached 80% of your allowance. You will receive a text message alerting you that you have used 80% of your allowance, however, if you exceed your allowance you won't be charged your data will be slowed down considerably. You can update the My O2 application via the application store or through iTunes!
<a href="http://dailyiphoneblog.com/2012/02/09/my-o2-app-updated-to-v2-5/">

[Read the original blog post]
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