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You can check how much data has been used during the time
cycle you set, set mobile data limit and warning, see what apps
have been using mobile data, or restrict background data for
individual apps.
NOTE:
The data usage is measured by your phone, and your carrier’s
data usage accounting may differ.
Touch > Network restrictions to select Wi-Fi networks that
are mobile hotspots. Apps may warn before using these
networks for large downloads to avoid high mobile data bills.
Flight Mode
Touch > > Settings > More and slide the switch beside
Flight mode to turn flight mode on or off. All the phone’s radios
that transmit voice or data are turned off when flight mode is on.
Tethering and Portable Hotspot
Touch > > Settings > More > Tethering & portable
hotspot to share your phone’s mobile data connection with
PCs or other devices via USB, Bluetooth or Wi-Fi. See Sharing
Your Mobile Data Connection.
VPN
Touch > > Settings > More > VPN to set up and
connect to virtual private networks. See Connecting to Virtual
Private Networks.