Some applications depend upon background data (transferring data when not directly in use). Restricting background data may cause those applications to stop functioning unless a Wi-Fi connection is available.
From a Home screen, select Apps.
From the Apps tab, select Settings.
From the WIRELESS & NETWORKS section, select Data usage.
Select an application (located below the usage graph).
Select Restrict background data.
Enabled when a check mark is present.
If presented, review the message then select OK.
Click here for info on setting data limits and warnings, changing the usage cycle on your device and viewing data usage by app.