Android Wi

Default

The default setting for an Android device is that it will disconnect from a Wi-Fi connection when the screen turns off. This setting can be convenient if you no longer want to use the connection and turn off your screen, but can be inconvenient if you are in the middle of a download and your screen automatically turns off due to inactivity. If you are in the middle of a download you may be at risk of an error, or potentially slower downloading speeds, as the device reverts to its service provider's data network.

Never

Setting the Android's Wi-Fi sleep policy to 'Never,' will allow the Wi-Fi connection to be the primary means of data transfer for the entire duration that you remain connected to the network. Android devices support applications that automatically update, even when your screen is off. If you're not connected to Wi-Fi, the device will revert to its cellular network at regular intervals to transfer data, using battery and typically retrieving items at lower speeds than on Wi-Fi. Set the sleep policy to 'Never,' to maintain a constant connection, improve battery life and take advantage of increased data transfer speeds.

Plugged In

An Android device also allows you to maintain a Wi-Fi connection at all times when it is plugged in, by choosing the 'Never when plugged in' option. This setting can be useful if you want to stay connected to a network that you feel is secure, and typically only plug in your device when you're in range of that network, in a safe location. It also enables you to charge your device in times where heavy data usage is taking place, and disconnecting from the Wi-Fi network when you're done and leaving the location.

Settings

Access the Wi-Fi sleep policy settings on your Android device by pressing the 'Menu' button at the home screen, tapping 'Settings,' selecting the 'Wireless & Networks' menu from the list. From the menu, select 'Wi-Fi Settings,' press the 'Menu' button and enter the 'Advanced' settings, tap 'Wi-Fi Sleep Policy' and set it as desired.