Calendar app eating up my mobile data

Since upgrading to an iPhone 5S with iOS7 I've regularly used up my mobile data allowance of 750 MB by the mid of the month. Almost never ran into that problem with my iPhone 3GS and iOS6.
I've checked mobile data usage in the settings and apparently the Calendar app is the culprit. It has racked up 421 MB in ten days. I am using iCloud. How is that even possible? Is anyone else having these kinds of problems with the Calendar app?

Same problem for me too. (iPhone 5 not 5S)

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Thanks for the suggestion DaVBMan, sadly it didn't work. The only thing that did work was to wait until midnight and it corrected itself. In the mind of the phone it lived a whole day twice and then skipped one completely in order to get back on track. Very odd and also I have since discovered it has happened to a few of my friends too.
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hey
scince i updated my mobile's software to " symbian belle refresh " it opens mobile data everyday at 00 : 00 !!
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and that made me lose alot of money
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notes :
1 - the problem statred after updating to " symbian belle refresh "
2 - it happens every day at the beginning of it
3 - there is no apps working in the background
4 - it's turned of at 23:59 and it's on at 00:00 !
help
my mobile is nokia C7

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Hey Naomi1111,
Thanks for the question. I understand that you are experiencing a weird issue with the calendar application on your iPhone 5. To troubleshoot, let’s first try restarting the Calendar application:
iOS: Force an app to close
http://support.apple.com/kb/HT5137
Next, let’s check your Date & Time settings to make sure they are configured correctly:
iOS: Troubleshooting issues with date and time
http://support.apple.com/kb/ts3920
And finally, if your issue persists, we’ll want to back up and restore your iPhone as new:
Use iTunes to restore your iOS device to factory settings
http://support.apple.com/kb/ht1414
Thanks,
Matt M.

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I now realise that this has been asked previously, only the 'previously asked?' search didnt' pick it up for me.
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Thanks for the suggestion DaVBMan, sadly it didn't work. The only thing that did work was to wait until midnight and it corrected itself. In the mind of the phone it lived a whole day twice and then skipped one completely in order to get back on track. Very odd and also I have since discovered it has happened to a few of my friends too.
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i've got my iPhone since almost 3 years and the only thing (really!) that keeps me longing to my Nokia 6210 is the fact that if i want to schedule an appointment in let's say this time next year, i have to go to month view and than skip month by month for ages. Nokia just let you do 'go to date' > tap 2/22/2014 > done.
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I am not familiar with a way to do it in the Calendar app itself on the iPhone. It is easier to do on an iPad with the Year pane. But a 3rd party app like Fantastical lets you do any date that you wish on the fly.

Calendar app eating up my mobile data

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