It's an awful feeling when you get a message from your wireless carrier indicating you've gone over your data plan. Overage charges these days are outrageous and the process of calling customer support to see if they will give you a break is rarely worth the effort.
The iPhone has some impressive features that run in the background which can do things like sync information between devices, automatically update applications and so on. However, if you aren't careful those background activities can really take a bite out of your cellular data. Here are a few things you can do to ensure you never get one of those messages again.