Samsung Galaxy S III User Manual page 16

1. Insert the USB cable into the phone's Charger/
Accessory jack.
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2. Connect the USB cable to the charging head.
Warning! While the device is charging, if the touch screen
does not function due to an unstable power supply,
unplug the USB power adapter from the power outlet
or unplug the USB cable from the device.
3. When charging is finished, first unplug the charger's
power plug from the AC wall outlet, and then
disconnect the USB cable connector from the device.