AT&T IFWA-40 User Manual page 30

You can view your voice and data usage once you have logged in to your account.
You may need to select the tab for your wireless plan and See all usage to see the
usage details for your AT&T Wireless Internet device's phone number.
If you did not provide an email address for email notifications when you purchased
your AT&T Wireless Internet device, you can choose to do so at att.com/myatt. Once
you have logged in to your account, go to Profile and enter a valid email address. You
will receive email notifications when you are approaching or have exceeded your data
plan limit. If you have a limited voice plan, you will also receive notifications as you are
approaching or have exceeded your voice plan limit.
You can also use the AT&T Wireless Internet Manager to check data usage details
by device. On any device that is connected to your AT&T Wireless Internet device,
enter http://attwirelessinternet directly into your browser address field. Log in
using "attadmin" (or your customized login) and go to Data Usage. To view data
usage notifications, go to Messages. The Information light on your AT&T Wireless
Internet device will blink green when you have a new notification.
NOTE: Actual billed usage can be higher than the estimated data usage displayed in
the usage meter.
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