All you need to know about spend caps is here
Hope that helps and welcome to the forum
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The apply a charge to bill or any other payforit charges you need to call customer service to ask them to do it on your account Guide: How to find help & contact O2
Don’t understand why a can’t apply the caps myself as just moved from Vodafone to o2 and on Vodafone you can switch off charge to bill or any other caps off on your account! A shall phone o2 to apply these. Thanks
The personal settings you can switch on and off with Voda are great, but unfortunately, O2 aren't that far advanced yet.
Track usage, upgrade and get support with the My O2 appDownload My O2