Why does iPhone continuously use 3G/data every hour, despite "everything" is turned off?

Every hour, one to several times an hour, the phone uses 0.1 to 20kb with 3G / GPRS. And this despite the fact that the following is off:
- WiFi
- Notifications
- Locations
- Push
Someone who can explain to me what/why the phone uses the GPRS for? I have unlimited GRPS included from my cellphone operator (NetCom in Norway), so this is no worries. However when I travel abroad, this can get expensive.
I know I just can turn of 3G, but I would still like to know why the continuos use of GRPS happens. In case it's an app or setting I haven't done anything with.
Just in case: no app is running :-)
Have looked online and there are many who have an opinion, but do not know. I'm looking for an answer, not what people think the the answer is :-)

Still trying to figure this out. Really trying to avoid having another iCloud for my next iPad. Can anyone confirm if the iPhone is storing a lot of OS files in iCloud? If you're backing up your iPhone to iCloud, what is your storage size?

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Does anyone know how to keep "iTunes accounts" under system from using cellular data?
I have already:
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2. Turned OFF all automatic downloads and any other options under iTunes/app store settings.
3. Turned OFF Background App refresh.
4. Turned OFF all options under iCloud sync menu.
Right now, the only thing that keeps "iTunes accounts" from pulling cellular data is turning Cellular Data completely OFF, but I don't want to do this because I lose some messaging and voicemail functions and I need to be able to use Find My Phone. I have two identical iPhone 5c's on this account. One is running iOs 8.1.2 and the above settings control it's data usage nicely. The other phone is running iOs 8.1.3 and this one uses 50-100 mb a day even with all the above settings off and the phone almost always on wifi.
I am aware that the phone will lose it's wifi connection when asleep, but that shouldn't be a problem if all the apps/settings are already set not to use cellular data. What am I missing. I've read a bunch of threads on this issue and they all suggest settings I already have OFF.

My personal phone is on 8.1.2. My daughter's phone is 8.1.3.
It is her phone that is currently having this problem, but I reported it under my account; sorry for the confusion.
My phone has had some data problems in the past, but I have been able to control them by keeping almost all data options OFF and the overall switch ON. My usage is back to less than 50 mb per month which makes sense since my phone is almost always on wifi and I don't use data dense applications.
Everything about my daughter's phone is the same as mine except for the 8.1.3 upgrade. She does use things like Instagram more than I do, but I have them all set to not use Cellular Data and the option to change these settings is locked. When I look at the usage on her phone, it isn't her apps that are pulling unexpected data; it's "iTunes accounts" under system services. All the options under iTunes/App Store (auto downloads, home sharing, etc.) and all the iCloud options are already OFF.

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alsdman,
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Hello,
Why does iPhone 5 shuts down with +2 C (celsius) degrees outside? This should be inside operating temperature limits? I´m living in Estonia and I was using iPhone 5 approximately 1 hour with +2 C (celsius) outside. Suddenly it just powered itself off with 25% of remaining battery. I was not able to switch it on again before warming it up inside the house.
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<Personal Information Edited by Host>

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Hint: NEVER put your personal info in a public forum. Edit your post to remove this info. Also, I'll ask the moderators to do it if you can't.

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Why does iPhone continuously use 3G/data every hour, despite "everything" is turned off?

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