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Connectivity
Your phone can connect to the Internet via your mobile phone operator or over a Wi-Fi network.
When A Wi-Fi network is configured and available the device will automatically choose the Wi-Fi
connection to reduce your mobile data usage.
GSM/WCDMA data connection
Different locations may have different mobile networks available. Initially, your phone is
configured to use the fastest mobile network available for data.
The icons on the Status bar indicate which kind of data network you’re connected to.
In the All apps screen, touch
Settings > More… > Mobile networks
to perform relevant settings.
Turn Data Off
Pull down twice for the Quick Settings Panel. Touch the Network signal icon (Your carrier). Touch
the Cellular data switch to switch off.
Or the same setting is also available from Settings > Data usage > Cellular