Google Galaxy Nexus Android mobile technology platform 4.0 Users Guide - Manual (Page 39)

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Set data usage limit
1 Check Set mobile data limit.
A dialog appears that describes the limit you're setting.
2 Read the message. If you're willing to proceed, click OK.
The red line at the top of the graph activates, so you can drag it up or down.
3 Drag the red line by its right side to the limit you want to set.
When your data usage reaches the limit, mobile data will be turned off automatically and many
features of your phone won't work correctly. You'll receive a notification when this occurs.
Important The usage displayed on the data usage settings screen is measured by your phone. Your carrier's data usage account-
ing may differ. Usage in excess of your carrier plan's data limits can result in steep overage charges. The feature
described here can help you track your usage, but is not guaranteed to prevent additional charges. For best results, set a
conservative limit.