Re: iPhone 4s excessive cellular data usage[ Edited ]
11-27-2011 09:18:57 PM - edited 11-27-2011 09:20:57 PM
I don't know if this will apply to your specific situation, but the info helped me out a lot. iMessage uses up data from your plan. I couldn't figure out how I made it to 100MB in about 2 days when I barely had it out of the box.
I switched off iMessaging and will be using text messaging (since I have unlimited) from now on.