Calculate Your Data...

The nice thing about shared data plans is that you can save money by getting a smaller shared amount of data. For instance, a family of four could share 6 GB of data instead of paying for four separate 3 GB plans.

To figure out how much data you're using, login to , then navigate to . Under the drop-down list that reads "Report," select "Web Usage Volume by Wireless Number" and click "Submit." You'll be able to see how much data each device has used over the last several months. You can also call *3282# from your AT&T handset to see how much data you've used so far this month.

...But Beware of Overages

AT&T's shared data plans come with one big gotcha: Overage charges for data are $15 per GB, instead of $10 per GB on individual and family plans. Because the penalties for exceeding your limit are more severe, you'll need to be careful about getting a plan that cuts it too close.