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You can use Wi-Fi for various functions on your phone that require a data connection, such as internet access. Follow these instructions to turn Wi-Fi on or off.
Find "Wireless & networks"
Press the menu icon.
Press Wireless & networks.
Turn Wi-Fi on or off
Press WiFi to turn Wi-Fi on or off.
When the box next to the menu item is ticked (V), Wi-Fi is turned on.
Press the Home key to return to standby mode.