Samsung Galaxy S III SCH-R530 User Manual page 142

1. From the Settings screen, under Wireless and network,
touch Data usage. The Data usage screen appears.
2. To enable mobile data, touch Mobile data.
3. To enable the limit, touch Set mobile data limit. A red
limit line appears in the Data usage screen.
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4. To adjust the mobile Data usage cycle, touch and drag
the vertical usage cycle lines left or right on the graph.
5. To adjust the mobile data usage warning level, touch
and drag the horizontal warning line up or down on the
graph.
6. To adjust the mobile data usage limit level, touch and
drag the horizontal limit line up or down on the graph.