Phone
To make and receive calls, the device must be switched
on, it must have a valid SIM card installed, and you must
be located in the service area of a cellular network.
To make or receive a net call, your device must be
connected to a net call service. To connect to a net call
service, your device must be in the coverage of a
connection network, such as a wireless LAN (WLAN)
access point.