Mobile data
Tap the Mobile data switch 
to toggle it On or Off. Off disconnects you from the mobile network so you can't
use the Internet unless you use a Wi-Fi connection. This allows you
to manage your mobile data usage. Tap Mobile data to access the following settings to manage your mobile data usage:
Limit mobile data usage Checkmark to limit your mobile data. Your mobile data connection will be disabled when you reach the limit you set. Set your data usage limit by dragging the red line on the graph provided.
Alert me about data usage Checkmark to allow your phone to alert you when your mobile data usage reaches the warning amount you set. Set your warning amount by dragging the orange line on the graph provided.
Data usage cycle: Displays your current data usage cycle. Tap the date to change the cycle date.
Data usage graph: Displays your data usage on a graph.
Data usage applications: Apps are displayed with their data usage on a bar graph. Tap one to see more detailed information.
Tap the Menu icon
(at the upper-right corner of
the mobile data screen) to access the following advanced options.Display in MB/GB: Displays data usage using MB or GB.
Data roaming Checkmark to allow you to use a mobile data connection when you're roaming outside your home network area.
Restrict background data: Checkmark to disable syncing in the background while using a mobile network.
Auto-sync data: Checkmark to set the phone to sync contact, calendar, email, bookmark, and social network image data automatically.
Show Wi-Fi usage: Displays a Wi-Fi tab (at the top of the screen) to display your Wi-Fi usage information.
Mobile hotspots: Displays a list to select and use another device's mobile network as a mobile hotspot for mobile data usage. Turn on Wi-Fi and search for mobile hotspots, if necessary. Apps can be restricted from using these networks when in the background. Apps may also warn before using these networks for large downloads.
Help: Displays information about Mobile data features.