Unexplained data usage

Hi, I have been on the 3.5GB monthly data plan for a number of months now, and have consistently only averaged usage of approx half of that data each month. Nothing data heavy, I usually use my phone to check emails, whatsapp and surf the net. This morning I received a notification from Telstra that my data usage is 50% with eight days to go which appeared normal. But at about 4pm I received another message from Telstra that my data usage has reached 85% or approx usage of over 1GB in just 8 hours. I have hardly used my phone in that time. It's now 7:45pm and I have just checked the Telstra 24x7 app and it shows my data usage allowance as 0% remaining. I'm quite concerned and am not sure where the data is draining to. Can someone please advice?

Hi Puimum, OK, the series of tips in the link below was specific to iPhone 6. I emphasise the need to chech what is using data, tap: Settings>, Cellular>, scroll right to the bottom of that page and tap System Services>. This will reveal the specific applications using data in descending order.
The tips in the link below go into more detail
I would also look at any Aut Backup settings under Settings>, iCloud. Check that this is off, otherwise everything you do could be being backed up to iCloud. (This is another lengthy topic - yell out if you need help with it)

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    elko wrote:
    After upgrading my ATT iPhone 4 to iOS5, I thought I would try out iCloud. I read somewhere, that it only syncs when it is connected to a powersource, and maybe I read that wrong, but I interpret it to mean when I am connected to either a power outlet or my computer using the cable. In otherwords, it wouldn't sync while I was out and about, away from my wireless home network, using the 3G network.
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    Because 2 days ago I racked up 80 MB of my data plan (not iCloud storage) while I slept at home, where I have a wireless network. I found this out by getting a text warning from ATT the next day, that I was close to using up my alloted 200MB data usage. I checked out my account online, and sure enough the 80MB transferred in the middle of the night. I didn't notice the "documents and data" setting was turned on so it looks like my apps updated while my phone was in sleep mode. Is there anything else it could be? I have everything iCloud turned off now and wondering if there is something I should know about to avoid wasting my data usage?
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