7 Replies Latest reply: Jun 11, 2013 6:46 PM by appler900
SnifferUK Level 1 Level 1

My iPhone 4 is at the latest iOS version.  Ever since I started using it in December I've found out that at the same time every day(midnight) when connected to wifi it will use a considerable amount of 3G. I only recently found this out last month when I went over my monthly allowance.


I can only surmise that iCloud is somehow using the mobile data connection to backup when I've locked my phone, plugged it into the wall to charge and am asleep.


Is there another rational explanation?


My wife has the same phone and does the same thing as I do at night but her phone doesn't use any 3G data when backing up.


Having checked my mobile bill for the last few months it is at exactly midnight that the phone starts using 3G data.....every night, without fail!!


It's driving me crazy trying to figure out what's going on so any help gratefully received.

iPhone 4, iOS 5.1
  • jlparr Level 1 Level 1

    Sniffer the same thing is happening to me! Since the 5.1 update all 3 of our phones have went over on data. This problem is turning quite costly.The phone is on WiFi and we a re all sleeping when ATT shows large amounts of data usage. I hope we get an answer.

  • asfdj Level 1 Level 1

    Troubleshooting 101


    Does the iPhone data usage counter pretty much agree with the carrier?


    No - This is rare, but it's happened. If the carrier is reporting massive data usage that your iPhone isn't seeing, it's possible that there's mis-reporting happening on the carrier end.


    Yes - They pretty much agree: Then your phone is really consuming that data, and you have to isolate the app or process. Causes can be any of the following: Message stuck in Outbox on an email account, Cellular Data being selected for iCloud functions including backup, document sync etc, iTunes Match, streaming audio and letting the phone fall asleep (which causes it to switch from WiFi to 3G), sync issues with email/calendar account, the list goes on.


    The large data hit on the carrier report is usually a subtotal of most recent usage, not a timestamp of exactly when the usage actually occurred.


    Isolating excessive data takes patience and some detective work, but it can be done.

  • Kkashyyyk Level 1 Level 1

    The exact same thing is happing on my wife's phone. I have reset the on=phone counter and it reports only 10MB of data sent but ATT shows nearly 500MB in the last couple days. It is setup to backup to my computer, not iCloud and it is connected to wifi when this data is supposed to be happening.

  • asfdj Level 1 Level 1

    AT&T always says "Sent" regardless of direction. On the iPhone counter, you should add sent+received to compare to AT&T's numbers.


    If Sent+Recieved on the iPhone = 500MB, it's something on the phone. Maybe it fell alseep while streaming Pandora or something. It doesn't stay on WiFi once the screen goes dark, unless connected to power - and I've seen cases where it doesn't even stay connected to WiFi then.


    If Sent+Recieved on the iPhone = 10MB, and AT&T claims 500MB, then that's a possible indicator of carrier misreporting. Getting a carrier to admit that is almost impossible, but Apple engineering seems quite confident that the iOS numbers can be trusted within a few percentage margin of error.


    Kkashyyyk - just curious - do you have an AT&T Microcell at home?

  • Kkashyyyk Level 1 Level 1

    No - I do not have a Microcell at home. In fact, I have 4 iPhone in the house and only the one is having the issue. It has happened 2 months in a row and been the cause for nearly 3GBs of extra data each month.

  • asfdj Level 1 Level 1

    We also have 4 iphones. Only two have this problem. In my case, I know it's the Microcell but that doesn't mean the same thing couldn't happen with a tower, and it doesn't explain WHY the data is being over-reported.


    Ours began consuming data March 13th according to AT&T, so we're nearing the end of month #2. I still don't have a solid answer as to why. I have a case with AT&T, but that's no assurance I'll ever get an answer. I continue to work on the issue - I always assume I'm on my own when troubleshooting stuff like this. I will post back in the days ahead as I narrow things down more. Meanwhile, to ease the pain, if you have WiFi at home, I'd suggest turning Cellular Data off on the iPhone when you're around the house.

  • appler900 Level 1 Level 1

    I am having this problem too on an Iphone 4.  It has been going over on the data plan for the past 2 months.  When the new billing cycle started, my daughter turned her data back on and it was over on the data within a week.  She turned the data off again but we just recieved a warning from ATT that even with it off, the phone is about to go over the next data level.  We have 3 other iphones that are not having this problem.