11GB? No wonder some of us are being throttled... true we have the capability, but why 11GB? What are you doing on a phone?
More than likely, his phone is rarely if ever connected to Wifi, and a lot of netflix/hulu streaming and audio streaming at high bitrates. Or heavy use of iTunes Match/iTunes in the cloud. And he might be very lucky, and not in a congested area, so AT&T might not be throttling him as strictly.
While I don't/can't track my iOS wifi usage, I'm pretty sure I go through several GB of data every month, BUT most of it is over Wifi (both at home and at work). Even then I'm still at around half a gig per month of cellular data usage. And on months when I'm out of town and have to tether? Forget it. A GB per day is easily possible.
Especially with LTE now, it's very possible to blast along and hog up data if you're not careful. Dropping down to 3G speeds is a really good restrictor to one's data usage, but when you remove that and have access to 10-20Gbps+ speeds, all bets are off.
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