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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. Your carrier’s data usage
accounting may differ.
VPN
In the Settings app, touch More > VPN to set up and connect to virtual private
networks. See Connecting to Virtual Private Networks.
Default SMS App
In the Settings app, touch More > Default SMS app to choose the preferred
application for sending and receiving SMS.
Tethering and Portable Hotspot
In the Settings app, touch More > Tethering & portable hotspot to share your
phone’s mobile data connection with PCs or other devices via USB or Wi-Fi. See
Sharing Your Mobile Data Connection.
Wi-Fi Calling
With Wi-Fi calling, you can send and receive calls and messages over a Wi-Fi
network using your existing service provider.
Touch the Home key > > Settings > More > Wi-Fi Calling > Help or contact
the service provider for details.