Google Galaxy Nexus Android mobile technology platform 4.0 Users Guide - Manual (Page 38)

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To adjust the settings described here:
1 Touch the Settings icon on a Home or All Apps screen.
2 Touch Wireless & networks > Data usage.
By default, you see the settings for mobile data: that is, the data
network or networks provided by your carrier:
It's possible to show Wi-Fi data usage settings in a separate tab. To do so,
touch the Menu icon , then Show W-Fi usage.
Near the top of the screen, note the on-off switch for mobile data. The
instructions that follow assume that this switch is turned on. If it's off,
you won't be able to use mobile data at all and many features of your
phone and apps won't work correctly.
Just below the on-off switch, note the data usage cycle. Touch it to
choose a different cycle. This date range is the period of time for which
the graph displays data usage.
The vertical white lines on the graph show a period of time within the
data usage cycle. This range determines the usage amount displayed
just below the graph. Drag lines to change the period.
Set data usage warning
S Drag the orange line by its right side to the level where you want to receive a warning.
When your data usage reaches this level, you'll receive a notification.