I upgraded to the iPhone 4 a little more than a month ago, I previously had an iPhone 3G. I have had the 200mb/month data plan since they introduced it. With the 3G over the 2 years I had it I never even came close to going near that 200mb limit. I watched videos on youtube, checked email, checked facebook, browsed the web, all that stuff. Now with the 4 I have had to shut off data to the phone entirely on the past billing cycle because it was about to go over my limit, and now, 9 days into my billing cycle I've used 113.xx mb of data. My dad also upgraded to the i4, he uses his phone for work so he's on it constantly, checking and replying to emails, browsing the web, checking the weather, watching videos, etc. He's used 22mb of data over the 9 days into the billing cycle, however, he has the more expensive, 2GB/month plan.
Since I noticed this problem, I have stopped using my phone for email/facebook, even though it was fine with the 3G even though i used the 3G for things that use data much more than the i4. I have all notifications turned off, my phone does not push for data and when I'm at home it's on wifi, over which it does not use data. I double click the home button to close out of an app every time I use an app on the phone, so there's nothing running in the background.
Tuesday morning 5/24/2011, there was 42+mb (approximately 1/4th of my monthly date usage limit) sent to my phone at 4:51am. I was at home, sleeping, not using my phone, and my phone was connected to wifi anyhow (over which it does not use data). Another 12.5mb of data was sent to my phone on 5/19 at 2:03 am, again when I'm at home and the phone is connected to wifi. Sounds like AT&T is trying to force me into paying an extra $10/month for a bigger data plan.
There are numerous reports of other iPhone users having the same problem. AT&T claims that the data usage is from apps updating in the background and them collecting information for my billing, data that I will not be charged for. The thing is, it shows up on my billing statement and I'm being charged for it, so AT&T is full of ****.
Anyone else here getting insane amounts of unexplained data usage on their iPhone in the early morning?