Samsung Galaxy Grand Prime - Manual (Page 37)

Basics
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To add an app to the Home screen, tap and select an app.
To change the settings for ultra power saving mode, such as network connectivity or sound,
tap
→ Settings.
To deactivate ultra power saving mode, tap → Disable ultra power saving mode.
The estimated maximum standby time shows the time remaining before the battery
power runs out if the device is not used. Standby time may vary depending on your
device settings and operating conditions.