If you search this forum (and Google) you will find many reports of iPhones using vast amounts of data.
It started with the iPhone 5 and iOS6.
It effects some people but not all and can come and go at random.
The fact that it is reported on all network forums suggests it is an Apple issue but they won't admit it.
Truth is no one knows the answer unfortunately except to buy a non Apple phone.....
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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