How do I disable Wi-Fi features on the ET-2803?

Press the home button, select Wi-Fi Setup and press OK, then select either Wi-Fi (Recommended) or Wi-Fi Direct and press OK. For Wi-Fi, press OK again, select Others, press OK, then select Disable Wi-Fi. For Wi-Fi Direct, press OK twice, press the down arrow button, select Disable Wi-Fi Direct, and press OK. Finally press OK to disable Wi-Fi features. (Page 49)