I have a 4s and hardly ever use data no over wifi. I bought the phone when it first came out and my average cellular data use was 200mb of my 2g plan. That's why I thought it was odd that I got a message from ATT about me going over my 2g only 10 days into my billing cycle. I updated to ios6 when it came out. Really the only thing that I have different is the podcast app. I've made sure it's set to only update with wi-fi. I've made sure that everything is wi-fi only. I'm not photo-streaming or doing anything to the cloud. I check my usage times on the ATT website and it has stuff like sent data for 400mb. The time it shows would be while I'm asleep at home and connected to wifi. It also has some 80mb sends when I know I was in my car listening to a previously downloaded podcast. It shows 80mb sends here and there, a few 3mb sends, and every couple of days a big one like 200mb or 400mb. All are sent data and different times and about 75% are times when I know my phone is on wifi on my home network. I'm just wondering if anyone else if having this trouble or could help me troubleshoot to find out what it is? I've deleted all my pictures and music off my phone just to see if it's trying to send those even though I have everything off or wifi only. My only next thing to do will be turn off cellular data. I've still got about 12 days in my billing cycle and am already almost at 3 gigs.