I have my suspicions on this, but I wanted to get other people's opinions on this before I take any action on my 4S, I have my work's Exchange Email service connected. I like to have my email when I'm out the office, but more importantly, having the calendar is massively helpful for me. However, I notice that I am chewing through my monthly data limit very quickly. I get 1gb a month from EE and I am breaching that every month. I don't do much surfing on 3G beyond your bog standard social networking and a bit of web browsing, but somehow every month I breach the limit. I get about 10 to 30 emails a day, but most are just text, very few attachments. Does exchange beast the data connection on 3G? Is it worthwhile me turning it off?