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Apologies for any concern or confusion experienced.
Unexpected or high data usage can be concerning however there is an opportunity for usage to increase without you changing your behaviour at all.
This is because many new device features can use data in the background, usually to provide you with a better browsing/playing/user experience.
We have had reports from many other customers over the past couple of years & have conducted full reviews of our usage recording systems/processes from end to end.
No systemic issue was found with the way that we record/monitor customers usage.
This is not to say that there are never issues with usage recording, no system is perfect, but these are very uncommon and in almost all cases the issue is actually an unknown or unused feature on the device itself.
I'd personally recommend keeping an eye on your usage via My Account http://tel.st/xkkcv & our 24x7 app http://tel.st/mwxkz as it is updated within 48 hours however data is usually current as of about 15mins ago.
You can information about data top ups here
If your plan includes an unlimited data allowance, data top-ups do not apply.
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