Zte Optus X Delight 2 - Settings; Wi-Fi Configuration; Bluetooth Connection; Mobile Network Settings

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Settings
The Settings app contains most of the tools for customizing and
configuring your phone.
Wi-Fi
Open Settings > Wi-Fi. You can turn Wi-Fi on or off and
configure your Wi-Fi connections. See Connecting to Wi-Fi.
Bluetooth
Open Settings > Bluetooth to switch Bluetooth On or Off and
view nearby Bluetooth devices
Mobile Network
Open Settings > Mobile network to control mobile data and
data roaming, check and manage mobile data use, set network
type, and set access point names and other network options.
See Connecting to Mobile Networks.
NOTE:
The data usage is measured by your phone, and your carrier’s
data usage accounting may differ.
Airplane Mode
Open Settings > Mobile network > Aeroplane mode to turn