'SIM service' view provides information on the SIM card of the user such as service plan type,
and available data amount. When the service plan includes two data speed (normal and high speed),
switching between the two modes is also available.
'WiFi service' view provides searching WiFi spot and automatic logging in when the terminal
detect WiFi spot of WirlessGate service.
(All SIM service plan of WirelessGate includes WiFi service)