I over used 65% of my data on my iPhone 4

I have AT&T and I hardly use the 3G just for iMessage which is texting… Does that cost money I have unlimited and it's not Internet? I also sometimes go on twitter but only for a few mins in the car when I'm bored… I clear out the apps when I leave my house by double clicking the home button and the apps I used I will shut off with the red circle with the white line across does that shut them off or do I have to log out of everything so my data won't be used?

IMessage is NOT texting. It uses data every time you send or receive messages.

Unless you turn off mobile data, the phone still uses about 1 MB of data daily

The phone won't use any data unless you have apps polling like news alerts, etc, but even then that is very small. Turn Wi-Fi on at home so its free data, texting is nothing… So little it won't matter even if texting alot. Facetime, video watching etc, viewing websites, takes up most of the data. I read news apps and sports apps all day long (apps not websites as they are better imo) and my data is always low.

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