Hi @Gatehill,
We're sorry to hear about the unexpected increase in your data usage.
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Unfortunately, it's not possible to view a day-by-day breakdown of your data usage in the iD Mobile app. However, you may be able to view this information in your phone's data usage settings, depending on your device. Once your bill has been generated, you'll also be able to see your overall usage for the billing period.
If you'd like us to investigate your data usage further, please contact our Customer Service team via Live Chat and they'll be happy to look into this for you.
You can contact them here: https://www.idmobile.co.uk/live-chat
Regards,
Gemma M
The iD Mobile Social Media Team