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Turn off network connections that you aren't using
When your device is outside a wireless coverage area, you can turn off your mobile network or Wi-Fi connections so that
your device doesn’t search for a wireless network signal continuously.
In the device settings, do any of the following:
• To turn off all connections, tap More. Turn on the Airplane mode switch.
• To turn off Wi-Fi only, tap Wi-Fi. Turn off the switch.