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By default, you see the settings for mobile data, that is, the data provided by your network
carriers.
5.5 More Settings
…
Airplane mode ON/OFF :
When airplane mode is selected, all wireless connectivity is
disabled. This icon will display in the status bar when Airplane mode is selected.
Default SMS app:
The system settings allow users to select a "default SMS app." Once
selected, only the default SMS app is able to write to the SMS Provider and only the
default SMS app receives the SMS. The default SMS app is responsible for writing details
to the SMS Provider when it receives or sends a new message.
Tethering & portable hotspot:
The device is used as a wireless modem for a PC, when
it‘s connected to the PC using a USB cable.
Tethering refers to connecting one device to another. In the context of mobile
phones or Internet tablets, tethering allows sharing the Internet connection of the phone or
phone with other devices such as laptops. Connection of the phone or Mobile with other
