Looks like we have a biggie here. According to reports, not only Verizon users are having problems with data usage on their iPhone. The handsets are using up too much data, but it’s the result of a bug. Apple already issued the patch for Verizon.
However, AT&T and Sprint are still having the problem. One AT&T user reportedly, picked up more than $100 in overage charges. Another says that his phone ate up 2GB of cellular data in three days. The bug seems to be the result of the handset not switching to wifi when in a hotspot. Whoops.
[via Electronista]

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I’m halfway through my billing cycle, I’ve had the iPhone 5 for about 10 days and I’ve used 1.8 GB. I’ve not been doing much on LTE, aside from speed tests, and usually use a few hundred megabytes. Thank AT&T I still have unlimited data.
John, take a look at your data use logs under your account. May be you can see some pattern where you were not responsible for any data usage.
see this http://ismashphone.com/2012/10/iphone-5-data-problems-also-affect-att-and-sprint-users.html?utm_source=feedburner this is why you need to check your account
i buy iphone 5 on plan. which is 130 dollars per month for one year. i receive my first bill for 150 dollars and after it the most shocking i received other one 1073 DOLLARS which is payable 12-12-2012. WTF TELECOM