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Cellular networks
o In this menu item, you can turn data roaming on or off.
o You can choose from the following network types: Only 2G,
3G only, Dual mode (2G / 3G).
o Edit access points.
o Manually search and choose a network.
18.2 Device
This menu option allows you to set up your device, ringtone and
other notification tones, check battery performance, manage
applications, and storage, and add an additional user account to
your device.
18.3 Personal
Location
In this menu, you can set how the device determines your
location:
o GPS, Wifi, bluetooth, mobile network (Very accurate)
o Wifi, bluetooth, cellular networks (Energy Saving)
o GPS (On device only)
Security
In this menu, you can set screen lock on your device to prevent
unauthorized access.