Samsung Galaxy S4 User Manual page 23

Note: If the charger is incorrectly connected, damage to the accessory
port will occur therefore voiding the phone's warranty.
5. When charging is finished, first unplug the charger's power
plug from the AC wall outlet, then disconnect the charger's
connector from the phone.
Important! If your handset has a touch screen display, please note that
a touch screen responds best to a light touch from the pad
of your finger or a non-metallic stylus. Using excessive
force or a metallic object when pressing on the touch
screen may damage the tempered glass surface and void
the warranty.
Getting Started 16