A Wi-Fi network connection allows your device to use data services, but unlike using the mobile network, using Wi-Fi
doesn't add charges to your data plan.
When you connect to a Wi-Fi network, your device saves the network information. The next time your device is within range
of the saved Wi-Fi network, and Wi-Fi is turned on, your device can connect to the network automatically.
Your device can be connected to the mobile network and a Wi-Fi network at the same time. For basic data functions, such
as using the Internet or downloading apps, your device is designed to try to use a saved Wi-Fi network before it tries to use
the mobile network. Keep in mind that if you leave Wi-Fi turned on, your battery might lose power more quickly.