Samsung Galaxy S4 User Manual page 324

Wi-Fi During Sleep
By default, when your device enter a sleep mode, your Wi-Fi
connection stays on all the time. If the feature is Never enabled
during sleep that current data usage is taken over by your SIM and
its network connection.
1. From the main Settings page, tap Connections tab
2. Press
sleep.
3. Select an available option:
• Always: maintains your current active Wi-Fi connection even during
sleep.
• Only when plugged in: maintains the active Wi-Fi connection only
when the device detects it is connected to a power supply. This reduced
the drain on your device's battery.
• Never (increase data usage): shuts off the current Wi-Fi connection
during sleep and diverts any current data usage to the cellular network
connection.
Check for Internet Service
Allows you to check for Wi-Fi Internet access once connected to a
WAP (Wireless Access Point).
1. From the main Settings page, tap Connections tab
2. Press
3. Tap the Check for Internet service field to activate the feature.
316
and then tap Advanced
and then tap Advanced.
Keep Wi-Fi on during
Wi-Fi.
Wi-Fi.