I’ve been using iOS 6 on my iPhone 4 since beta 4 and had nothing but problems with 3G service.
Let me clarify.
I’m near wifi spots nearly all the time, so I have the 200meg data plan, the absolute minimum data plan I can get with AT&T. But since installing iOS 6 I’ve gotten 2 texts from AT&T that I’ve been going over my data limits. Since then I’ve been disabling cellular data, enabling it here and there when I want to check something real quick: maps, messages, Twitter. I’ve been operating this way for about a month.
It’s a pain in the butt. Something is gobbling up all my data and I don’t know what it is. I need Little Snitch for my phone.
Today I figured I’d start doing detective work. While out and about I double-checked all my settings in my apps: whatever I can turn off cellular data for I turn off. I restrict everything I can to wifi-only. I switched cellular data back on for maybe 15-20 seconds. I checked the usage page.
1.3 megs downloaded..
I turned it off. I open the multi-task tray and close EVERYTHING, thinking that it would eliminate any background processes.
I try again. 20 seconds later I’m up to about 4.5 megs downloaded.
I don’t know what the culprit is. I suspect it’s iTunes Match, but I explicitly set that so it doesn’t use cellular data. I’m on the iOS 6 GM that was released last week, so maybe that’s it, but from what I can tell the build numbers are the same.
Right now I’m doing a clean sweep and reinstall from iTunes. I don’t even think I’ll restore from a backup. I’m going to do a fresh install as if this is my first iPhone and see what happens.